18081020 has 24 divisors (see below), whose sum is σ = 38350368. Its totient is φ = 7160000.

The previous prime is 18080999. The next prime is 18081023. The reversal of 18081020 is 2018081.

It is a super-3 number, since 3×18081020³ (a number of 23 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 18080983 and 18081001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18081023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2456 + ... + 6495.

It is an arithmetic number, because the mean of its divisors is an integer number (1597932).

Almost surely, 2^18081020 is an apocalyptic number.

18081020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18081020 is an abundant number, since it is smaller than the sum of its proper divisors (20269348).

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

18081020 is a wasteful number, since it uses less digits than its factorization.

18081020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9061 (or 9059 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 20.

The square root of 18081020 is about 4252.1782653130. The cubic root of 18081020 is about 262.4667592073.

It can be divided in two parts, 1808 and 1020, that multiplied together give a triangular number (1844160 = T₁₉₂₀).

The spelling of 18081020 in words is "eighteen million, eighty-one thousand, twenty".