20687274474 has 16 divisors (see below), whose sum is σ = 41446262208. Its totient is φ = 6883805952.

The previous prime is 20687274469. The next prime is 20687274523. The reversal of 20687274474 is 47447278602.

It is a super-3 number, since 3×20687274474³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2984302 + ... + 2991225.

It is an arithmetic number, because the mean of its divisors is an integer number (2590391388).

Almost surely, 2^20687274474 is an apocalyptic number.

20687274474 is an abundant number, since it is smaller than the sum of its proper divisors (20758987734).

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

20687274474 is a wasteful number, since it uses less digits than its factorization.

20687274474 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5976109.

The product of its (nonzero) digits is 4214784, while the sum is 51.

The spelling of 20687274474 in words is "twenty billion, six hundred eighty-seven million, two hundred seventy-four thousand, four hundred seventy-four".