20001522550 has 24 divisors (see below), whose sum is σ = 39391235496. Its totient is φ = 7529984640.

The previous prime is 20001522539. The next prime is 20001522551. The reversal of 20001522550 is 5522510002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20001522551) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11764752 + ... + 11766451.

It is an arithmetic number, because the mean of its divisors is an integer number (1641301479).

Almost surely, 2^20001522550 is an apocalyptic number.

20001522550 is a deficient number, since it is larger than the sum of its proper divisors (19389712946).

20001522550 is a wasteful number, since it uses less digits than its factorization.

20001522550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23531232 (or 23531227 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 22.

The spelling of 20001522550 in words is "twenty billion, one million, five hundred twenty-two thousand, five hundred fifty".