18901020 has 48 divisors (see below), whose sum is σ = 53222400. Its totient is φ = 5011776.

The previous prime is 18901013. The next prime is 18901027. The reversal of 18901020 is 2010981.

It is an interprime number because it is at equal distance from previous prime (18901013) and next prime (18901027).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18901027) 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, 11149 + ... + 12731.

It is an arithmetic number, because the mean of its divisors is an integer number (1108800).

Almost surely, 2^18901020 is an apocalyptic number.

18901020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18901020 is an abundant number, since it is smaller than the sum of its proper divisors (34321380).

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

18901020 is a wasteful number, since it uses less digits than its factorization.

18901020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1794 (or 1792 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 21.

The square root of 18901020 is about 4347.5303334192. The cubic root of 18901020 is about 266.3759922994.

The spelling of 18901020 in words is "eighteen million, nine hundred one thousand, twenty".