20686704478212 has 24 divisors (see below), whose sum is σ = 48269093636512. Its totient is φ = 6895551513600.

The previous prime is 20686704478177. The next prime is 20686704478213. The reversal of 20686704478212 is 21287440768602.

It is not an unprimeable number, because it can be changed into a prime (20686704478213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3751287 + ... + 7446177.

Almost surely, 2^{20686704478212} is an apocalyptic number.

It is an amenable number.

20686704478212 is an abundant number, since it is smaller than the sum of its proper divisors (27582389158300).

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

20686704478212 is a wasteful number, since it uses less digits than its factorization.

20686704478212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4161459 (or 4161457 counting only the distinct ones).

The product of its (nonzero) digits is 14450688, while the sum is 57.

The spelling of 20686704478212 in words is "twenty trillion, six hundred eighty-six billion, seven hundred four million, four hundred seventy-eight thousand, two hundred twelve".