20731260 has 96 divisors (see below), whose sum is σ = 64157184. Its totient is φ = 4960000.

The previous prime is 20731253. The next prime is 20731267. The reversal of 20731260 is 6213702.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20731253) and next prime (20731267).

It is a Smith number, since the sum of its digits (21) coincides with the sum of the digits of its prime factors.

20731260 is an undulating number in base 6.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20731267) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 66505 + ... + 66815.

It is an arithmetic number, because the mean of its divisors is an integer number (668304).

Almost surely, 2^20731260 is an apocalyptic number.

20731260 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20731260, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32078592).

20731260 is an abundant number, since it is smaller than the sum of its proper divisors (43425924).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20731260 is a wasteful number, since it uses less digits than its factorization.

20731260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 435 (or 433 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 21.

The square root of 20731260 is about 4553.1593426982. The cubic root of 20731260 is about 274.7104831858.

Adding to 20731260 its reverse (6213702), we get a palindrome (26944962).

It can be divided in two parts, 2073 and 1260, that added together give a palindrome (3333).

The spelling of 20731260 in words is "twenty million, seven hundred thirty-one thousand, two hundred sixty".