19972140 has 48 divisors (see below), whose sum is σ = 56136192. Its totient is φ = 5305536.

The previous prime is 19972111. The next prime is 19972151. The reversal of 19972140 is 4127991.

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, 21567 + ... + 22473.

It is an arithmetic number, because the mean of its divisors is an integer number (1169504).

Almost surely, 2^19972140 is an apocalyptic number.

19972140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19972140 is an abundant number, since it is smaller than the sum of its proper divisors (36164052).

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

19972140 is a wasteful number, since it uses less digits than its factorization.

19972140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1286 (or 1284 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 33.

The square root of 19972140 is about 4469.0200268068. The cubic root of 19972140 is about 271.3156636318.

The spelling of 19972140 in words is "nineteen million, nine hundred seventy-two thousand, one hundred forty".