20856879950 has 12 divisors (see below), whose sum is σ = 38793796800. Its totient is φ = 8342751960.

The previous prime is 20856879907. The next prime is 20856879971. The reversal of 20856879950 is 5997865802.

It is a self number, because there is not a number n which added to its sum of digits gives 20856879950.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 208568750 + ... + 208568849.

It is an arithmetic number, because the mean of its divisors is an integer number (3232816400).

Almost surely, 2^20856879950 is an apocalyptic number.

20856879950 is a deficient number, since it is larger than the sum of its proper divisors (17936916850).

20856879950 is a wasteful number, since it uses less digits than its factorization.

20856879950 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 417137611 (or 417137606 counting only the distinct ones).

The product of its (nonzero) digits is 10886400, while the sum is 59.

The spelling of 20856879950 in words is "twenty billion, eight hundred fifty-six million, eight hundred seventy-nine thousand, nine hundred fifty".