20601240 has 64 divisors (see below), whose sum is σ = 67426560. Its totient is φ = 4993920.

The previous prime is 20601233. The next prime is 20601241. The reversal of 20601240 is 4210602.

It is a super-2 number, since 2×20601240² = 848822179075200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20601241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6484 + ... + 9123.

It is an arithmetic number, because the mean of its divisors is an integer number (1053540).

Almost surely, 2^20601240 is an apocalyptic number.

20601240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20601240 is an abundant number, since it is smaller than the sum of its proper divisors (46825320).

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

20601240 is a wasteful number, since it uses less digits than its factorization.

20601240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15632 (or 15628 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 20601240 is about 4538.8588874297. The cubic root of 20601240 is about 274.1349788715.

Adding to 20601240 its reverse (4210602), we get a palindrome (24811842).

The spelling of 20601240 in words is "twenty million, six hundred one thousand, two hundred forty".