20639292 has 24 divisors (see below), whose sum is σ = 50991696. Its totient is φ = 6475008.

The previous prime is 20639291. The next prime is 20639327. The reversal of 20639292 is 29293602.

It is a happy number.

It is a super-2 number, since 2×20639292² = 851960748522528, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20639291) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50383 + ... + 50790.

It is an arithmetic number, because the mean of its divisors is an integer number (2124654).

Almost surely, 2^20639292 is an apocalyptic number.

It is an amenable number.

20639292 is an abundant number, since it is smaller than the sum of its proper divisors (30352404).

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

20639292 is a wasteful number, since it uses less digits than its factorization.

20639292 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101197 (or 101195 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 33.

The square root of 20639292 is about 4543.0487560668. The cubic root of 20639292 is about 274.3036575253.

The spelling of 20639292 in words is "twenty million, six hundred thirty-nine thousand, two hundred ninety-two".