20905571260 has 48 divisors (see below), whose sum is σ = 50184953280. Its totient is φ = 7165969920.

The previous prime is 20905571231. The next prime is 20905571261. The reversal of 20905571260 is 6217550902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20905571261) by changing a digit.

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, 696646 + ... + 726034.

It is an arithmetic number, because the mean of its divisors is an integer number (1045519860).

Almost surely, 2^20905571260 is an apocalyptic number.

20905571260 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20905571260 is an abundant number, since it is smaller than the sum of its proper divisors (29279382020).

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

20905571260 is a wasteful number, since it uses less digits than its factorization.

20905571260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34486 (or 34484 counting only the distinct ones).

The product of its (nonzero) digits is 37800, while the sum is 37.

The spelling of 20905571260 in words is "twenty billion, nine hundred five million, five hundred seventy-one thousand, two hundred sixty".