18775620 has 36 divisors (see below), whose sum is σ = 56953260. Its totient is φ = 5006784.

The previous prime is 18775609. The next prime is 18775661. The reversal of 18775620 is 2657781.

It can be written as a sum of positive squares in 2 ways, for example, as 13793796 + 4981824 = 3714^2 + 2232^2 .

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

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 51975 + ... + 52334.

It is an arithmetic number, because the mean of its divisors is an integer number (1582035).

Almost surely, 2^18775620 is an apocalyptic number.

18775620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18775620 is an abundant number, since it is smaller than the sum of its proper divisors (38177640).

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

18775620 is a wasteful number, since it uses less digits than its factorization.

18775620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104324 (or 104319 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 36.

The square root of 18775620 is about 4333.0843518215. The cubic root of 18775620 is about 265.7855886144.

The spelling of 18775620 in words is "eighteen million, seven hundred seventy-five thousand, six hundred twenty".