20887474220 has 12 divisors (see below), whose sum is σ = 43863695904. Its totient is φ = 8354989680.

The previous prime is 20887474189. The next prime is 20887474243. The reversal of 20887474220 is 2247478802.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 522186836 + ... + 522186875.

It is an arithmetic number, because the mean of its divisors is an integer number (3655307992).

Almost surely, 2^20887474220 is an apocalyptic number.

20887474220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20887474220 is an abundant number, since it is smaller than the sum of its proper divisors (22976221684).

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

20887474220 is a wasteful number, since it uses less digits than its factorization.

20887474220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1044373720 (or 1044373718 counting only the distinct ones).

The product of its (nonzero) digits is 401408, while the sum is 44.

The spelling of 20887474220 in words is "twenty billion, eight hundred eighty-seven million, four hundred seventy-four thousand, two hundred twenty".