20634813806 has 8 divisors (see below), whose sum is σ = 30954105120. Its totient is φ = 10316778768.

The previous prime is 20634813763. The next prime is 20634813841. The reversal of 20634813806 is 60831843602.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 271871 + ... + 339386.

It is an arithmetic number, because the mean of its divisors is an integer number (3869263140).

Almost surely, 2^20634813806 is an apocalyptic number.

20634813806 is a deficient number, since it is larger than the sum of its proper divisors (10319291314).

20634813806 is a wasteful number, since it uses less digits than its factorization.

20634813806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 628138.

The product of its (nonzero) digits is 165888, while the sum is 41.

The spelling of 20634813806 in words is "twenty billion, six hundred thirty-four million, eight hundred thirteen thousand, eight hundred six".