20638869406 has 16 divisors (see below), whose sum is σ = 31248373104. Its totient is φ = 10222839424.

The previous prime is 20638869389. The next prime is 20638869413. The reversal of 20638869406 is 60496883602.

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, 435576 + ... + 480628.

It is an arithmetic number, because the mean of its divisors is an integer number (1953023319).

Almost surely, 2^20638869406 is an apocalyptic number.

20638869406 is a deficient number, since it is larger than the sum of its proper divisors (10609503698).

20638869406 is a wasteful number, since it uses less digits than its factorization.

20638869406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47195.

The product of its (nonzero) digits is 2985984, while the sum is 52.

The spelling of 20638869406 in words is "twenty billion, six hundred thirty-eight million, eight hundred sixty-nine thousand, four hundred six".