20687274475 has 72 divisors (see below), whose sum is σ = 30390816768. Its totient is φ = 13926427200.

The previous prime is 20687274469. The next prime is 20687274523. The reversal of 20687274475 is 57447278602.

It is not a de Polignac number, because 20687274475 - 2³³ = 12097339883 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 16023580 + ... + 16024870.

Almost surely, 2^20687274475 is an apocalyptic number.

20687274475 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20687274475 is a deficient number, since it is larger than the sum of its proper divisors (9703542293).

20687274475 is a wasteful number, since it uses less digits than its factorization.

20687274475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1545 (or 1533 counting only the distinct ones).

The product of its (nonzero) digits is 5268480, while the sum is 52.

The spelling of 20687274475 in words is "twenty billion, six hundred eighty-seven million, two hundred seventy-four thousand, four hundred seventy-five".