20388550220 has 12 divisors (see below), whose sum is σ = 42815955504. Its totient is φ = 8155420080.

The previous prime is 20388550219. The next prime is 20388550241. The reversal of 20388550220 is 2205588302.

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, 509713736 + ... + 509713775.

It is an arithmetic number, because the mean of its divisors is an integer number (3567996292).

Almost surely, 2^20388550220 is an apocalyptic number.

20388550220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20388550220 is an abundant number, since it is smaller than the sum of its proper divisors (22427405284).

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

20388550220 is a wasteful number, since it uses less digits than its factorization.

20388550220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1019427520 (or 1019427518 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 35.

The spelling of 20388550220 in words is "twenty billion, three hundred eighty-eight million, five hundred fifty thousand, two hundred twenty".