20881694215 has 16 divisors (see below), whose sum is σ = 25677169056. Its totient is φ = 16292851200.

The previous prime is 20881694179. The next prime is 20881694219. The reversal of 20881694215 is 51249618802.

It is not a de Polignac number, because 20881694215 - 2²⁷ = 20747476487 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20881694219) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 732835 + ... + 760795.

It is an arithmetic number, because the mean of its divisors is an integer number (1604823066).

Almost surely, 2^20881694215 is an apocalyptic number.

20881694215 is a deficient number, since it is larger than the sum of its proper divisors (4795474841).

20881694215 is a wasteful number, since it uses less digits than its factorization.

20881694215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31650.

The product of its (nonzero) digits is 276480, while the sum is 46.

It can be divided in two parts, 208816 and 94215, that added together give a triangular number (303031 = T₇₇₈).

The spelling of 20881694215 in words is "twenty billion, eight hundred eighty-one million, six hundred ninety-four thousand, two hundred fifteen".