1553620420 has 48 divisors (see below), whose sum is σ = 3561884928. Its totient is φ = 564527360.

The previous prime is 1553620403. The next prime is 1553620433. The reversal of 1553620420 is 240263551.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 558072 + ... + 560848.

It is an arithmetic number, because the mean of its divisors is an integer number (74205936).

Almost surely, 2^1553620420 is an apocalyptic number.

1553620420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1553620420 is an abundant number, since it is smaller than the sum of its proper divisors (2008264508).

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

1553620420 is a wasteful number, since it uses less digits than its factorization.

1553620420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5340 (or 5338 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 1553620420 is about 39415.9919322094. The cubic root of 1553620420 is about 1158.1948787236.

Adding to 1553620420 its reverse (240263551), we get a palindrome (1793883971).

The spelling of 1553620420 in words is "one billion, five hundred fifty-three million, six hundred twenty thousand, four hundred twenty".