20412138638 has 16 divisors (see below), whose sum is σ = 30698214624. Its totient is φ = 10179420960.

The previous prime is 20412138611. The next prime is 20412138701. The reversal of 20412138638 is 83683121402.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3248756 + ... + 3255032.

It is an arithmetic number, because the mean of its divisors is an integer number (1918638414).

Almost surely, 2^20412138638 is an apocalyptic number.

20412138638 is a deficient number, since it is larger than the sum of its proper divisors (10286075986).

20412138638 is a wasteful number, since it uses less digits than its factorization.

20412138638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10267.

The product of its (nonzero) digits is 55296, while the sum is 38.

The spelling of 20412138638 in words is "twenty billion, four hundred twelve million, one hundred thirty-eight thousand, six hundred thirty-eight".