19945812 has 48 divisors (see below), whose sum is σ = 48263040. Its totient is φ = 6406272.

The previous prime is 19945799. The next prime is 19945829. The reversal of 19945812 is 21854991.

Its product of digits (25920) is a multiple of the sum of its prime factors (480).

It is a congruent number.

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, 74014 + ... + 74282.

It is an arithmetic number, because the mean of its divisors is an integer number (1005480).

Almost surely, 2^19945812 is an apocalyptic number.

19945812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

19945812 is an abundant number, since it is smaller than the sum of its proper divisors (28317228).

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

19945812 is a wasteful number, since it uses less digits than its factorization.

19945812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 480 (or 478 counting only the distinct ones).

The product of its digits is 25920, while the sum is 39.

The square root of 19945812 is about 4466.0734431937. The cubic root of 19945812 is about 271.1963918212.

The spelling of 19945812 in words is "nineteen million, nine hundred forty-five thousand, eight hundred twelve".