20399044 has 12 divisors (see below), whose sum is σ = 35732368. Its totient is φ = 10189800.

The previous prime is 20399039. The next prime is 20399053. The reversal of 20399044 is 44099302.

It is a super-2 number, since 2×20399044² = 832241992227872, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20398997 and 20399015.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4459 + ... + 7789.

Almost surely, 2^20399044 is an apocalyptic number.

It is an amenable number.

20399044 is a deficient number, since it is larger than the sum of its proper divisors (15333324).

20399044 is a wasteful number, since it uses less digits than its factorization.

20399044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4866 (or 4864 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 20399044 is about 4516.5300840358. The cubic root of 20399044 is about 273.2351732927.

The spelling of 20399044 in words is "twenty million, three hundred ninety-nine thousand, forty-four".