19987772 has 24 divisors (see below), whose sum is σ = 42080640. Its totient is φ = 8115120.

The previous prime is 19987769. The next prime is 19987789. The reversal of 19987772 is 27778991.

It is a super-2 number, since 2×19987772² = 799022059047968, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 19987772.

It is a congruent number.

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, 18254 + ... + 19317.

It is an arithmetic number, because the mean of its divisors is an integer number (1753360).

Almost surely, 2^19987772 is an apocalyptic number.

It is an amenable number.

19987772 is an abundant number, since it is smaller than the sum of its proper divisors (22092868).

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

19987772 is a wasteful number, since it uses less digits than its factorization.

19987772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37601 (or 37599 counting only the distinct ones).

The product of its digits is 444528, while the sum is 50.

The square root of 19987772 is about 4470.7686140081. The cubic root of 19987772 is about 271.3864305505.

The spelling of 19987772 in words is "nineteen million, nine hundred eighty-seven thousand, seven hundred seventy-two".