20505522254 has 24 divisors (see below), whose sum is σ = 36007969320. Its totient is φ = 8732099376.

The previous prime is 20505522253. The next prime is 20505522259. The reversal of 20505522254 is 45222550502.

It is a self number, because there is not a number n which added to its sum of digits gives 20505522254.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20505522251) 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, 650984 + ... + 681755.

It is an arithmetic number, because the mean of its divisors is an integer number (1500332055).

Almost surely, 2^20505522254 is an apocalyptic number.

20505522254 is a deficient number, since it is larger than the sum of its proper divisors (15502447066).

20505522254 is a wasteful number, since it uses less digits than its factorization.

20505522254 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1332912 (or 1332905 counting only the distinct ones).

The product of its (nonzero) digits is 40000, while the sum is 32.

The spelling of 20505522254 in words is "twenty billion, five hundred five million, five hundred twenty-two thousand, two hundred fifty-four".