18020772 has 144 divisors (see below), whose sum is σ = 58988160. Its totient is φ = 4656960.

The previous prime is 18020767. The next prime is 18020773. The reversal of 18020772 is 27702081.

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

It is not an unprimeable number, because it can be changed into a prime (18020773) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 91378 + ... + 91574.

It is an arithmetic number, because the mean of its divisors is an integer number (409640).

Almost surely, 2^18020772 is an apocalyptic number.

18020772 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18020772, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29494080).

18020772 is an abundant number, since it is smaller than the sum of its proper divisors (40967388).

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

18020772 is a wasteful number, since it uses less digits than its factorization.

18020772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239 (or 220 counting only the distinct ones).

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

The square root of 18020772 is about 4245.0879849539. The cubic root of 18020772 is about 262.1749118527.

The spelling of 18020772 in words is "eighteen million, twenty thousand, seven hundred seventy-two".