20985552732 has 48 divisors (see below), whose sum is σ = 49626984960. Its totient is φ = 6900945792.

The previous prime is 20985552713. The next prime is 20985552787. The reversal of 20985552732 is 23725558902.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1230568 + ... + 1247504.

It is an arithmetic number, because the mean of its divisors is an integer number (1033895520).

Almost surely, 2^20985552732 is an apocalyptic number.

It is an amenable number.

20985552732 is an abundant number, since it is smaller than the sum of its proper divisors (28641432228).

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

20985552732 is a wasteful number, since it uses less digits than its factorization.

20985552732 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18330 (or 18328 counting only the distinct ones).

The product of its (nonzero) digits is 1512000, while the sum is 48.

The spelling of 20985552732 in words is "twenty billion, nine hundred eighty-five million, five hundred fifty-two thousand, seven hundred thirty-two".