20501542220 has 12 divisors (see below), whose sum is σ = 43053238704. Its totient is φ = 8200616880.

The previous prime is 20501542181. The next prime is 20501542231. The reversal of 20501542220 is 2224510502.

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 3 ways as a sum of consecutive naturals, for example, 512538536 + ... + 512538575.

It is an arithmetic number, because the mean of its divisors is an integer number (3587769892).

Almost surely, 2^20501542220 is an apocalyptic number.

20501542220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20501542220 is an abundant number, since it is smaller than the sum of its proper divisors (22551696484).

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

20501542220 is a wasteful number, since it uses less digits than its factorization.

20501542220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1025077120 (or 1025077118 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 23.

The spelling of 20501542220 in words is "twenty billion, five hundred one million, five hundred forty-two thousand, two hundred twenty".