20505408952 has 32 divisors (see below), whose sum is σ = 44350830720. Its totient is φ = 8705898720.

The previous prime is 20505408929. The next prime is 20505408953. The reversal of 20505408952 is 25980450502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20505408953) 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 7 ways as a sum of consecutive naturals, for example, 1705074 + ... + 1717057.

It is an arithmetic number, because the mean of its divisors is an integer number (1385963460).

Almost surely, 2^20505408952 is an apocalyptic number.

It is an amenable number.

20505408952 is an abundant number, since it is smaller than the sum of its proper divisors (23845421768).

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

20505408952 is a wasteful number, since it uses less digits than its factorization.

20505408952 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3422251 (or 3422247 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 40.

The spelling of 20505408952 in words is "twenty billion, five hundred five million, four hundred eight thousand, nine hundred fifty-two".