20202221990 has 32 divisors (see below), whose sum is σ = 36552060000. Its totient is φ = 8039155968.

The previous prime is 20202221989. The next prime is 20202222023. The reversal of 20202221990 is 9912220202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3704786 + ... + 3710234.

It is an arithmetic number, because the mean of its divisors is an integer number (1142251875).

Almost surely, 2^20202221990 is an apocalyptic number.

20202221990 is a deficient number, since it is larger than the sum of its proper divisors (16349838010).

20202221990 is a wasteful number, since it uses less digits than its factorization.

20202221990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7304.

The product of its (nonzero) digits is 2592, while the sum is 29.

The spelling of 20202221990 in words is "twenty billion, two hundred two million, two hundred twenty-one thousand, nine hundred ninety".