20712040 has 32 divisors (see below), whose sum is σ = 46863360. Its totient is φ = 8238400.

The previous prime is 20712037. The next prime is 20712053. The reversal of 20712040 is 4021702.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6285 + ... + 8995.

It is an arithmetic number, because the mean of its divisors is an integer number (1464480).

Almost surely, 2^20712040 is an apocalyptic number.

20712040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20712040 is an abundant number, since it is smaller than the sum of its proper divisors (26151320).

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

20712040 is a wasteful number, since it uses less digits than its factorization.

20712040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2913 (or 2909 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 16.

The square root of 20712040 is about 4551.0482309024. The cubic root of 20712040 is about 274.6255620247.

Adding to 20712040 its reverse (4021702), we get a palindrome (24733742).

The spelling of 20712040 in words is "twenty million, seven hundred twelve thousand, forty".