20681325 has 60 divisors (see below), whose sum is σ = 43811680. Its totient is φ = 9447840.

The previous prime is 20681317. The next prime is 20681327. The reversal of 20681325 is 52318602.

It is not a de Polignac number, because 20681325 - 2³ = 20681317 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20681327) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 13446 + ... + 14904.

Almost surely, 2^20681325 is an apocalyptic number.

20681325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20681325 is an abundant number, since it is smaller than the sum of its proper divisors (23130355).

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

20681325 is a wasteful number, since it uses less digits than its factorization.

20681325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1488 (or 1474 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 20681325 is about 4547.6724816108. The cubic root of 20681325 is about 274.4897425174.

Adding to 20681325 its reverse (52318602), we get a palindrome (72999927).

The spelling of 20681325 in words is "twenty million, six hundred eighty-one thousand, three hundred twenty-five".