20399612 has 12 divisors (see below), whose sum is σ = 36851136. Its totient is φ = 9870720.

The previous prime is 20399593. The next prime is 20399633. The reversal of 20399612 is 21699302.

It is a super-2 number, since 2×20399612² = 832288339501088, which contains 22 as substring.

It is a congruent number.

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, 82133 + ... + 82380.

It is an arithmetic number, because the mean of its divisors is an integer number (3070928).

Almost surely, 2^20399612 is an apocalyptic number.

It is an amenable number.

20399612 is a deficient number, since it is larger than the sum of its proper divisors (16451524).

20399612 is a wasteful number, since it uses less digits than its factorization.

20399612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164548 (or 164546 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 32.

The square root of 20399612 is about 4516.5929637283. The cubic root of 20399612 is about 273.2377092961.

The spelling of 20399612 in words is "twenty million, three hundred ninety-nine thousand, six hundred twelve".