20900506220 has 48 divisors (see below), whose sum is σ = 47919126528. Its totient is φ = 7594157760.

The previous prime is 20900506139. The next prime is 20900506223. The reversal of 20900506220 is 2260500902.

It is a self number, because there is not a number n which added to its sum of digits gives 20900506220.

It is not an unprimeable number, because it can be changed into a prime (20900506223) 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, 245237 + ... + 319283.

It is an arithmetic number, because the mean of its divisors is an integer number (998315136).

Almost surely, 2^20900506220 is an apocalyptic number.

20900506220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20900506220 is an abundant number, since it is smaller than the sum of its proper divisors (27018620308).

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

20900506220 is a wasteful number, since it uses less digits than its factorization.

20900506220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75350 (or 75348 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 26.

The spelling of 20900506220 in words is "twenty billion, nine hundred million, five hundred six thousand, two hundred twenty".