19972220 has 24 divisors (see below), whose sum is σ = 42112224. Its totient is φ = 7956416.

The previous prime is 19972201. The next prime is 19972259. The reversal of 19972220 is 2227991.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3362 + ... + 7158.

It is an arithmetic number, because the mean of its divisors is an integer number (1754676).

Almost surely, 2^19972220 is an apocalyptic number.

19972220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19972220 is an abundant number, since it is smaller than the sum of its proper divisors (22140004).

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

19972220 is a wasteful number, since it uses less digits than its factorization.

19972220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4069 (or 4067 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 19972220 is about 4469.0289773059. The cubic root of 19972220 is about 271.3160258902.

The spelling of 19972220 in words is "nineteen million, nine hundred seventy-two thousand, two hundred twenty".