20404012 has 24 divisors (see below), whose sum is σ = 38435040. Its totient is φ = 9442560.

The previous prime is 20404009. The next prime is 20404039. The reversal of 20404012 is 21040402.

It is a super-2 number, since 2×20404012² = 832647411392288, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20403983 and 20404001.

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, 1689 + ... + 6607.

It is an arithmetic number, because the mean of its divisors is an integer number (1601460).

Almost surely, 2^20404012 is an apocalyptic number.

It is an amenable number.

20404012 is a deficient number, since it is larger than the sum of its proper divisors (18031028).

20404012 is a wasteful number, since it uses less digits than its factorization.

20404012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5001 (or 4999 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 13.

The square root of 20404012 is about 4517.0800302851. The cubic root of 20404012 is about 273.2573527987.

Adding to 20404012 its reverse (21040402), we get a palindrome (41444414).

The spelling of 20404012 in words is "twenty million, four hundred four thousand, twelve".