19957956 has 24 divisors (see below), whose sum is σ = 46641504. Its totient is φ = 6642240.

The previous prime is 19957921. The next prime is 19957967. The reversal of 19957956 is 65975991.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 19957899 and 19957908.

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, 12736 + ... + 14216.

It is an arithmetic number, because the mean of its divisors is an integer number (1943396).

Almost surely, 2^19957956 is an apocalyptic number.

It is an amenable number.

19957956 is an abundant number, since it is smaller than the sum of its proper divisors (26683548).

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

19957956 is a wasteful number, since it uses less digits than its factorization.

19957956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2611 (or 2609 counting only the distinct ones).

The product of its digits is 765450, while the sum is 51.

The square root of 19957956 is about 4467.4328198642. The cubic root of 19957956 is about 271.2514199279.

The spelling of 19957956 in words is "nineteen million, nine hundred fifty-seven thousand, nine hundred fifty-six".