20870639706 has 32 divisors (see below), whose sum is σ = 47762362368. Its totient is φ = 5955784560.

The previous prime is 20870639681. The next prime is 20870639719. The reversal of 20870639706 is 60793607802.

It is a Curzon 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, 267330 + ... + 336461.

It is an arithmetic number, because the mean of its divisors is an integer number (1492573824).

Almost surely, 2^20870639706 is an apocalyptic number.

20870639706 is an abundant number, since it is smaller than the sum of its proper divisors (26891722662).

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

20870639706 is a wasteful number, since it uses less digits than its factorization.

20870639706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 604626.

The product of its (nonzero) digits is 762048, while the sum is 48.

The spelling of 20870639706 in words is "twenty billion, eight hundred seventy million, six hundred thirty-nine thousand, seven hundred six".