20451722260 has 24 divisors (see below), whose sum is σ = 42967640520. Its totient is φ = 8177065344.

The previous prime is 20451722243. The next prime is 20451722261. The reversal of 20451722260 is 6222715402.

It can be written as a sum of positive squares in 4 ways, for example, as 409091076 + 20042631184 = 20226^2 + 141572^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20451722261) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 179959 + ... + 270718.

It is an arithmetic number, because the mean of its divisors is an integer number (1790318355).

Almost surely, 2^20451722260 is an apocalyptic number.

20451722260 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20451722260 is an abundant number, since it is smaller than the sum of its proper divisors (22515918260).

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

20451722260 is a wasteful number, since it uses less digits than its factorization.

20451722260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 452955 (or 452953 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 31.

The spelling of 20451722260 in words is "twenty billion, four hundred fifty-one million, seven hundred twenty-two thousand, two hundred sixty".