1556201920 has 112 divisors (see below), whose sum is σ = 4560954048. Its totient is φ = 492503040.

The previous prime is 1556201917. The next prime is 1556201921. The reversal of 1556201920 is 291026551.

It is a tau number, because it is divible by the number of its divisors (112).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1556201921) 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, 2400 + ... + 55840.

It is an arithmetic number, because the mean of its divisors is an integer number (40722804).

Almost surely, 2^1556201920 is an apocalyptic number.

1556201920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1556201920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2280477024).

1556201920 is an abundant number, since it is smaller than the sum of its proper divisors (3004752128).

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

1556201920 is a wasteful number, since it uses less digits than its factorization.

1556201920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53478 (or 53468 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 1556201920 is about 39448.7252012026. The cubic root of 1556201920 is about 1158.8360103604.

The spelling of 1556201920 in words is "one billion, five hundred fifty-six million, two hundred one thousand, nine hundred twenty".