20621280552 has 128 divisors (see below), whose sum is σ = 53533180800. Its totient is φ = 6615318528.

The previous prime is 20621280539. The next prime is 20621280557. The reversal of 20621280552 is 25508212602.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (20621280557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22196824 + ... + 22197752.

It is an arithmetic number, because the mean of its divisors is an integer number (418227975).

Almost surely, 2^20621280552 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20621280552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26766590400).

20621280552 is an abundant number, since it is smaller than the sum of its proper divisors (32911900248).

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

20621280552 is a wasteful number, since it uses less digits than its factorization.

20621280552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1275 (or 1271 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 33.

The spelling of 20621280552 in words is "twenty billion, six hundred twenty-one million, two hundred eighty thousand, five hundred fifty-two".