18620940 has 48 divisors (see below), whose sum is σ = 56151648. Its totient is φ = 4583424.

The previous prime is 18620887. The next prime is 18620947. The reversal of 18620940 is 4902681.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 18620898 and 18620907.

It is not an unprimeable number, because it can be changed into a prime (18620947) 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, 11157 + ... + 12716.

It is an arithmetic number, because the mean of its divisors is an integer number (1169826).

Almost surely, 2^18620940 is an apocalyptic number.

18620940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18620940 is an abundant number, since it is smaller than the sum of its proper divisors (37530708).

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

18620940 is a wasteful number, since it uses less digits than its factorization.

18620940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23898 (or 23896 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 18620940 is about 4315.1987208007. The cubic root of 18620940 is about 265.0536974370.

The spelling of 18620940 in words is "eighteen million, six hundred twenty thousand, nine hundred forty".