19956408 has 64 divisors (see below), whose sum is σ = 52682400. Its totient is φ = 6289920.

The previous prime is 19956407. The next prime is 19956439. The reversal of 19956408 is 80465991.

It is a self number, because there is not a number n which added to its sum of digits gives 19956408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19956407) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36618 + ... + 37158.

Almost surely, 2^19956408 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19956408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26341200).

19956408 is an abundant number, since it is smaller than the sum of its proper divisors (32725992).

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

19956408 is a wasteful number, since it uses less digits than its factorization.

19956408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 632 (or 628 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 42.

The square root of 19956408 is about 4467.2595626402. The cubic root of 19956408 is about 271.2444067171.

The spelling of 19956408 in words is "nineteen million, nine hundred fifty-six thousand, four hundred eight".