18862020 has 36 divisors (see below), whose sum is σ = 57215340. Its totient is φ = 5029824.

The previous prime is 18861989. The next prime is 18862021. The reversal of 18862020 is 2026881.

18862020 is a `hidden beast` number, since 18 + 8 + 620 + 20 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 2604996 + 16257024 = 1614^2 + 4032^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (18862021) 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, 52215 + ... + 52574.

It is an arithmetic number, because the mean of its divisors is an integer number (1589315).

Almost surely, 2^18862020 is an apocalyptic number.

18862020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18862020 is an abundant number, since it is smaller than the sum of its proper divisors (38353320).

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

18862020 is a wasteful number, since it uses less digits than its factorization.

18862020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104804 (or 104799 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 18862020 is about 4343.0427122007. The cubic root of 18862020 is about 266.1926544486.

The spelling of 18862020 in words is "eighteen million, eight hundred sixty-two thousand, twenty".