18922620 has 24 divisors (see below), whose sum is σ = 52983504. Its totient is φ = 5046016.

The previous prime is 18922601. The next prime is 18922621. The reversal of 18922620 is 2622981.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18922621) 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, 157629 + ... + 157748.

It is an arithmetic number, because the mean of its divisors is an integer number (2207646).

Almost surely, 2^18922620 is an apocalyptic number.

18922620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18922620 is an abundant number, since it is smaller than the sum of its proper divisors (34060884).

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

18922620 is a wasteful number, since it uses less digits than its factorization.

18922620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315389 (or 315387 counting only the distinct ones).

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

The square root of 18922620 is about 4350.0137930816. The cubic root of 18922620 is about 266.4774247627.

The spelling of 18922620 in words is "eighteen million, nine hundred twenty-two thousand, six hundred twenty".