20638199624 has 64 divisors (see below), whose sum is σ = 45789840000. Its totient is φ = 8532453888.

The previous prime is 20638199579. The next prime is 20638199639. The reversal of 20638199624 is 42699183602.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2088407 + ... + 2098265.

It is an arithmetic number, because the mean of its divisors is an integer number (715466250).

Almost surely, 2^20638199624 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20638199624, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22894920000).

20638199624 is an abundant number, since it is smaller than the sum of its proper divisors (25151640376).

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

20638199624 is a wasteful number, since it uses less digits than its factorization.

20638199624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11190 (or 11186 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 50.

The spelling of 20638199624 in words is "twenty billion, six hundred thirty-eight million, one hundred ninety-nine thousand, six hundred twenty-four".