1620424920 has 32 divisors (see below), whose sum is σ = 4861275120. Its totient is φ = 432113280.

The previous prime is 1620424843. The next prime is 1620424951. The reversal of 1620424920 is 294240261.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6751651 + ... + 6751890.

Almost surely, 2^1620424920 is an apocalyptic number.

1620424920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1620424920 is an abundant number, since it is smaller than the sum of its proper divisors (3240850200).

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

1620424920 is a wasteful number, since it uses less digits than its factorization.

1620424920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13503555 (or 13503551 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 1620424920 is about 40254.5018600404. The cubic root of 1620424920 is about 1174.5629689022.

The spelling of 1620424920 in words is "one billion, six hundred twenty million, four hundred twenty-four thousand, nine hundred twenty".