18142020 has 72 divisors (see below), whose sum is σ = 59271576. Its totient is φ = 4465152.

The previous prime is 18141997. The next prime is 18142021. The reversal of 18142020 is 2024181.

It can be written as a sum of positive squares in 4 ways, for example, as 3944196 + 14197824 = 1986^2 + 3768^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 18141984 and 18142002.

It is not an unprimeable number, because it can be changed into a prime (18142021) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1537 + ... + 6216.

Almost surely, 2^18142020 is an apocalyptic number.

18142020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18142020 is an abundant number, since it is smaller than the sum of its proper divisors (41129556).

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

18142020 is a wasteful number, since it uses less digits than its factorization.

18142020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7781 (or 7776 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 18142020 is about 4259.3450200706. The cubic root of 18142020 is about 262.7615895712.

The spelling of 18142020 in words is "eighteen million, one hundred forty-two thousand, twenty".