20202221988 has 144 divisors (see below), whose sum is σ = 58359677376. Its totient is φ = 6071345280.

The previous prime is 20202221939. The next prime is 20202221989. The reversal of 20202221988 is 88912220202.

It is a happy number.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (20202221989) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 524758 + ... + 561938.

Almost surely, 2^20202221988 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20202221988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29179838688).

20202221988 is an abundant number, since it is smaller than the sum of its proper divisors (38157455388).

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

20202221988 is a wasteful number, since it uses less digits than its factorization.

20202221988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37256 (or 37242 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The spelling of 20202221988 in words is "twenty billion, two hundred two million, two hundred twenty-one thousand, nine hundred eighty-eight".