19800516 has 24 divisors (see below), whose sum is σ = 48210624. Its totient is φ = 6313120.

The previous prime is 19800497. The next prime is 19800553. The reversal of 19800516 is 61500891.

It is a happy number.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

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, 35595 + ... + 36146.

It is an arithmetic number, because the mean of its divisors is an integer number (2008776).

Almost surely, 2^19800516 is an apocalyptic number.

It is an amenable number.

19800516 is an abundant number, since it is smaller than the sum of its proper divisors (28410108).

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

19800516 is a wasteful number, since it uses less digits than its factorization.

19800516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71771 (or 71769 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 30.

The square root of 19800516 is about 4449.7770730678. Note that the first 3 decimals coincide. The cubic root of 19800516 is about 270.5362729718.

The spelling of 19800516 in words is "nineteen million, eight hundred thousand, five hundred sixteen".