1620220244 has 12 divisors (see below), whose sum is σ = 2835702324. Its totient is φ = 810019584.

The previous prime is 1620220219. The next prime is 1620220253. The reversal of 1620220244 is 4420220261.

It can be written as a sum of positive squares in 2 ways, for example, as 113848900 + 1506371344 = 10670^2 + 38812^2 .

It is a super-2 number, since 2×1620220244² = 5250227278134839072, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32612 + ... + 65604.

It is an arithmetic number, because the mean of its divisors is an integer number (236308527).

Almost surely, 2^1620220244 is an apocalyptic number.

It is an amenable number.

1620220244 is a deficient number, since it is larger than the sum of its proper divisors (1215482080).

1620220244 is a wasteful number, since it uses less digits than its factorization.

1620220244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45274 (or 45272 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 23.

The square root of 1620220244 is about 40251.9595050974. The cubic root of 1620220244 is about 1174.5135137727.

The spelling of 1620220244 in words is "one billion, six hundred twenty million, two hundred twenty thousand, two hundred forty-four".