20531122260 has 96 divisors (see below), whose sum is σ = 63207309312. Its totient is φ = 4938030720.

The previous prime is 20531122259. The next prime is 20531122279. The reversal of 20531122260 is 6222113502.

It is a self number, because there is not a number n which added to its sum of digits gives 20531122260.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 38652 + ... + 206291.

It is an arithmetic number, because the mean of its divisors is an integer number (658409472).

Almost surely, 2^20531122260 is an apocalyptic number.

20531122260 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20531122260, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31603654656).

20531122260 is an abundant number, since it is smaller than the sum of its proper divisors (42676187052).

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

20531122260 is a wasteful number, since it uses less digits than its factorization.

20531122260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245093 (or 245091 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

Adding to 20531122260 its reverse (6222113502), we get a palindrome (26753235762).

The spelling of 20531122260 in words is "twenty billion, five hundred thirty-one million, one hundred twenty-two thousand, two hundred sixty".