18772020 has 48 divisors (see below), whose sum is σ = 58403520. Its totient is φ = 5005728.

The previous prime is 18772001. The next prime is 18772021. The reversal of 18772020 is 2027781.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18772021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16842 + ... + 17921.

It is an arithmetic number, because the mean of its divisors is an integer number (1216740).

Almost surely, 2^18772020 is an apocalyptic number.

18772020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18772020 is an abundant number, since it is smaller than the sum of its proper divisors (39631500).

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

18772020 is a wasteful number, since it uses less digits than its factorization.

18772020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34781 (or 34773 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 27.

The square root of 18772020 is about 4332.6689234235. The cubic root of 18772020 is about 265.7686004621.

The spelling of 18772020 in words is "eighteen million, seven hundred seventy-two thousand, twenty".