19720456 has 32 divisors (see below), whose sum is σ = 42546240. Its totient is φ = 8394048.

The previous prime is 19720451. The next prime is 19720457. The reversal of 19720456 is 65402791.

It is not an unprimeable number, because it can be changed into a prime (19720451) 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, 7671 + ... + 9913.

It is an arithmetic number, because the mean of its divisors is an integer number (1329570).

Almost surely, 2^19720456 is an apocalyptic number.

It is an amenable number.

19720456 is an abundant number, since it is smaller than the sum of its proper divisors (22825784).

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

19720456 is a wasteful number, since it uses less digits than its factorization.

19720456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2413 (or 2409 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 19720456 is about 4440.7720049559. The cubic root of 19720456 is about 270.1711580520.

The spelling of 19720456 in words is "nineteen million, seven hundred twenty thousand, four hundred fifty-six".