20513302550 has 24 divisors (see below), whose sum is σ = 41089724256. Its totient is φ = 7574142240.

The previous prime is 20513302541. The next prime is 20513302561. The reversal of 20513302550 is 5520331502.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15778814 + ... + 15780113.

It is an arithmetic number, because the mean of its divisors is an integer number (1712071844).

Almost surely, 2^20513302550 is an apocalyptic number.

20513302550 is an abundant number, since it is smaller than the sum of its proper divisors (20576421706).

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

20513302550 is a wasteful number, since it uses less digits than its factorization.

20513302550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31558952 (or 31558947 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 26.

The spelling of 20513302550 in words is "twenty billion, five hundred thirteen million, three hundred two thousand, five hundred fifty".