18720846 has 24 divisors (see below), whose sum is σ = 41552784. Its totient is φ = 6087840.

The previous prime is 18720803. The next prime is 18720847. The reversal of 18720846 is 64802781.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 18720846.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18720847) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11946 + ... + 13421.

It is an arithmetic number, because the mean of its divisors is an integer number (1731366).

Almost surely, 2^18720846 is an apocalyptic number.

18720846 is an abundant number, since it is smaller than the sum of its proper divisors (22831938).

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

18720846 is a wasteful number, since it uses less digits than its factorization.

18720846 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25416 (or 25413 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 18720846 is about 4326.7592953618. The cubic root of 18720846 is about 265.5268786560.

The spelling of 18720846 in words is "eighteen million, seven hundred twenty thousand, eight hundred forty-six".