19972940 has 24 divisors (see below), whose sum is σ = 45170160. Its totient is φ = 7374528.

The previous prime is 19972913. The next prime is 19972949. The reversal of 19972940 is 4927991.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (19972949) 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, 38150 + ... + 38669.

It is an arithmetic number, because the mean of its divisors is an integer number (1882090).

Almost surely, 2^19972940 is an apocalyptic number.

19972940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19972940 is an abundant number, since it is smaller than the sum of its proper divisors (25197220).

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

19972940 is a wasteful number, since it uses less digits than its factorization.

19972940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76841 (or 76839 counting only the distinct ones).

The product of its (nonzero) digits is 40824, while the sum is 41.

The square root of 19972940 is about 4469.1095309916. The cubic root of 19972940 is about 271.3192861719.

The spelling of 19972940 in words is "nineteen million, nine hundred seventy-two thousand, nine hundred forty".