20686704478134 has 32 divisors (see below), whose sum is σ = 43884128717280. Its totient is φ = 6478540603392.

The previous prime is 20686704478087. The next prime is 20686704478177. The reversal of 20686704478134 is 43187440768602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 178158859 + ... + 178274934.

It is an arithmetic number, because the mean of its divisors is an integer number (1371379022415).

Almost surely, 2^{20686704478134} is an apocalyptic number.

20686704478134 is an abundant number, since it is smaller than the sum of its proper divisors (23197424239146).

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

20686704478134 is a wasteful number, since it uses less digits than its factorization.

20686704478134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 356434384.

The product of its (nonzero) digits is 43352064, while the sum is 60.

The spelling of 20686704478134 in words is "twenty trillion, six hundred eighty-six billion, seven hundred four million, four hundred seventy-eight thousand, one hundred thirty-four".