18726920 has 16 divisors (see below), whose sum is σ = 42135660. Its totient is φ = 7490752.

The previous prime is 18726901. The next prime is 18726923. The reversal of 18726920 is 2962781.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 18645124 + 81796 = 4318^2 + 286^2 .

It is not an unprimeable number, because it can be changed into a prime (18726923) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 234047 + ... + 234126.

Almost surely, 2^18726920 is an apocalyptic number.

18726920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18726920 is an abundant number, since it is smaller than the sum of its proper divisors (23408740).

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

18726920 is a wasteful number, since it uses less digits than its factorization.

18726920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 468184 (or 468180 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 18726920 is about 4327.4611494501. The cubic root of 18726920 is about 265.5555923845. Note that the first 4 decimals are identical.

The spelling of 18726920 in words is "eighteen million, seven hundred twenty-six thousand, nine hundred twenty".