20887861374 has 24 divisors (see below), whose sum is σ = 46309523832. Its totient is φ = 6800698800.

The previous prime is 20887861367. The next prime is 20887861381. The reversal of 20887861374 is 47316878802.

It is a happy number.

20887861374 is a `hidden beast` number, since 208 + 8 + 7 + 8 + 61 + 374 = 666.

It is an interprime number because it is at equal distance from previous prime (20887861367) and next prime (20887861381).

It is a self number, because there is not a number n which added to its sum of digits gives 20887861374.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13492677 + ... + 13494224.

It is an arithmetic number, because the mean of its divisors is an integer number (1929563493).

Almost surely, 2^20887861374 is an apocalyptic number.

20887861374 is an abundant number, since it is smaller than the sum of its proper divisors (25421662458).

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

20887861374 is a wasteful number, since it uses less digits than its factorization.

20887861374 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26986952 (or 26986949 counting only the distinct ones).

The product of its (nonzero) digits is 3612672, while the sum is 54.

The spelling of 20887861374 in words is "twenty billion, eight hundred eighty-seven million, eight hundred sixty-one thousand, three hundred seventy-four".