1620670220 has 48 divisors (see below), whose sum is σ = 3791612160. Its totient is φ = 577764096.

The previous prime is 1620670187. The next prime is 1620670223. The reversal of 1620670220 is 220760261.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a self number, because there is not a number n which added to its sum of digits gives 1620670220.

It is not an unprimeable number, because it can be changed into a prime (1620670223) 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, 99932 + ... + 115011.

It is an arithmetic number, because the mean of its divisors is an integer number (78991920).

Almost surely, 2^1620670220 is an apocalyptic number.

1620670220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1620670220 is an abundant number, since it is smaller than the sum of its proper divisors (2170941940).

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

1620670220 is a wasteful number, since it uses less digits than its factorization.

1620670220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214994 (or 214992 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 1620670220 is about 40257.5486089255. The cubic root of 1620670220 is about 1174.6222343775.

The spelling of 1620670220 in words is "one billion, six hundred twenty million, six hundred seventy thousand, two hundred twenty".