19902990220 has 24 divisors (see below), whose sum is σ = 42096978000. Its totient is φ = 7903920192.

The previous prime is 19902990199. The next prime is 19902990221. The reversal of 19902990220 is 2209920991.

It is a super-2 number, since 2×19902990220² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19902990221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3576895 + ... + 3582454.

It is an arithmetic number, because the mean of its divisors is an integer number (1754040750).

Almost surely, 2^19902990220 is an apocalyptic number.

19902990220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19902990220 is an abundant number, since it is smaller than the sum of its proper divisors (22193987780).

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

19902990220 is a wasteful number, since it uses less digits than its factorization.

19902990220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7159497 (or 7159495 counting only the distinct ones).

The product of its (nonzero) digits is 52488, while the sum is 43.

The spelling of 19902990220 in words is "nineteen billion, nine hundred two million, nine hundred ninety thousand, two hundred twenty".