20531222124 has 48 divisors (see below), whose sum is σ = 55252243200. Its totient is φ = 5812243776.

The previous prime is 20531222093. The next prime is 20531222183. The reversal of 20531222124 is 42122213502.

It is a junction number, because it is equal to n+sod(n) for n = 20531222094 and 20531222103.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1112034 + ... + 1130345.

It is an arithmetic number, because the mean of its divisors is an integer number (1151088400).

Almost surely, 2^20531222124 is an apocalyptic number.

It is an amenable number.

20531222124 is an abundant number, since it is smaller than the sum of its proper divisors (34721021076).

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

20531222124 is a wasteful number, since it uses less digits than its factorization.

20531222124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2242502 (or 2242500 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

Adding to 20531222124 its reverse (42122213502), we get a palindrome (62653435626).

The spelling of 20531222124 in words is "twenty billion, five hundred thirty-one million, two hundred twenty-two thousand, one hundred twenty-four".