18720460 has 24 divisors (see below), whose sum is σ = 42887376. Its totient is φ = 6807360.

The previous prime is 18720433. The next prime is 18720467. The reversal of 18720460 is 6402781.

It is a super-2 number, since 2×18720460² = 700911245223200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18720467) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 42327 + ... + 42766.

It is an arithmetic number, because the mean of its divisors is an integer number (1786974).

Almost surely, 2^18720460 is an apocalyptic number.

18720460 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18720460 is an abundant number, since it is smaller than the sum of its proper divisors (24166916).

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

18720460 is a wasteful number, since it uses less digits than its factorization.

18720460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85113 (or 85111 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 18720460 is about 4326.7146889990. The cubic root of 18720460 is about 265.5250537014.

The spelling of 18720460 in words is "eighteen million, seven hundred twenty thousand, four hundred sixty".