20072904 has 32 divisors (see below), whose sum is σ = 51008640. Its totient is φ = 6580800.

The previous prime is 20072867. The next prime is 20072917. The reversal of 20072904 is 40927002.

It is a Harshad number since it is a multiple of its sum of digits (24).

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, 5392 + ... + 8319.

It is an arithmetic number, because the mean of its divisors is an integer number (1594020).

Almost surely, 2^20072904 is an apocalyptic number.

20072904 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20072904 is an abundant number, since it is smaller than the sum of its proper divisors (30935736).

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

20072904 is a wasteful number, since it uses less digits than its factorization.

20072904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13781 (or 13777 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 20072904 is about 4480.2794555697. The cubic root of 20072904 is about 271.7711815525.

Adding to 20072904 its reverse (40927002), we get a palindrome (60999906).

The spelling of 20072904 in words is "twenty million, seventy-two thousand, nine hundred four".