18956420 has 24 divisors (see below), whose sum is σ = 45495744. Its totient is φ = 6499296.

The previous prime is 18956417. The next prime is 18956423. The reversal of 18956420 is 2465981.

It is an interprime number because it is at equal distance from previous prime (18956417) and next prime (18956423).

It is a Harshad number since it is a multiple of its sum of digits (35).

It is not an unprimeable number, because it can be changed into a prime (18956423) 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, 67562 + ... + 67841.

It is an arithmetic number, because the mean of its divisors is an integer number (1895656).

Almost surely, 2^18956420 is an apocalyptic number.

18956420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18956420 is an abundant number, since it is smaller than the sum of its proper divisors (26539324).

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

18956420 is a wasteful number, since it uses less digits than its factorization.

18956420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135419 (or 135417 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 18956420 is about 4353.8971048935. The cubic root of 18956420 is about 266.6359929996.

The spelling of 18956420 in words is "eighteen million, nine hundred fifty-six thousand, four hundred twenty".