20015571220 has 48 divisors (see below), whose sum is σ = 42663475008. Its totient is φ = 7886977280.

The previous prime is 20015571217. The next prime is 20015571227. The reversal of 20015571220 is 2217551002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20015571227) 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, 331059 + ... + 386821.

It is an arithmetic number, because the mean of its divisors is an integer number (888822396).

Almost surely, 2^20015571220 is an apocalyptic number.

20015571220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20015571220 is an abundant number, since it is smaller than the sum of its proper divisors (22647903788).

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

20015571220 is a wasteful number, since it uses less digits than its factorization.

20015571220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56040 (or 56038 counting only the distinct ones).

The product of its (nonzero) digits is 1400, while the sum is 25.

The spelling of 20015571220 in words is "twenty billion, fifteen million, five hundred seventy-one thousand, two hundred twenty".