20638692 has 24 divisors (see below), whose sum is σ = 53508000. Its totient is φ = 6879528.

The previous prime is 20638669. The next prime is 20638699. The reversal of 20638692 is 29683602.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (20638699) 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, 95442 + ... + 95657.

It is an arithmetic number, because the mean of its divisors is an integer number (2229500).

Almost surely, 2^20638692 is an apocalyptic number.

It is an amenable number.

20638692 is an abundant number, since it is smaller than the sum of its proper divisors (32869308).

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

20638692 is a wasteful number, since it uses less digits than its factorization.

20638692 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191112 (or 191104 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 20638692 is about 4542.9827206363. The cubic root of 20638692 is about 274.3009994272.

The spelling of 20638692 in words is "twenty million, six hundred thirty-eight thousand, six hundred ninety-two".