20139772 has 12 divisors (see below), whose sum is σ = 37099720. Its totient is φ = 9539856.

The previous prime is 20139737. The next prime is 20139773. The reversal of 20139772 is 27793102.

It is a super-2 number, since 2×20139772² = 811220832423968, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20139773) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 132423 + ... + 132574.

Almost surely, 2^20139772 is an apocalyptic number.

It is an amenable number.

20139772 is a deficient number, since it is larger than the sum of its proper divisors (16959948).

20139772 is a wasteful number, since it uses less digits than its factorization.

20139772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265020 (or 265018 counting only the distinct ones).

The product of its (nonzero) digits is 5292, while the sum is 31.

The square root of 20139772 is about 4487.7357319700. The cubic root of 20139772 is about 272.0726269440.

The spelling of 20139772 in words is "twenty million, one hundred thirty-nine thousand, seven hundred seventy-two".