18920898 has 32 divisors (see below), whose sum is σ = 44521920. Its totient is φ = 5935680.

The previous prime is 18920897. The next prime is 18920899. The reversal of 18920898 is 89802981.

It is an interprime number because it is at equal distance from previous prime (18920897) and next prime (18920899).

It is a super-2 number, since 2×18920898² = 716000762252808, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18920897) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9388 + ... + 11223.

It is an arithmetic number, because the mean of its divisors is an integer number (1391310).

Almost surely, 2^18920898 is an apocalyptic number.

18920898 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

18920898 is an abundant number, since it is smaller than the sum of its proper divisors (25601022).

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

18920898 is a wasteful number, since it uses less digits than its factorization.

18920898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20639 (or 20633 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 45.

The square root of 18920898 is about 4349.8158581715. The cubic root of 18920898 is about 266.4693411737.

The spelling of 18920898 in words is "eighteen million, nine hundred twenty thousand, eight hundred ninety-eight".