20575156340 has 12 divisors (see below), whose sum is σ = 43207828356. Its totient is φ = 8230062528.

The previous prime is 20575156337. The next prime is 20575156363. The reversal of 20575156340 is 4365157502.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 16036169956 + 4538986384 = 126634^2 + 67372^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20575156294 and 20575156303.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 514378889 + ... + 514378928.

It is an arithmetic number, because the mean of its divisors is an integer number (3600652363).

Almost surely, 2^20575156340 is an apocalyptic number.

20575156340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20575156340 is an abundant number, since it is smaller than the sum of its proper divisors (22632672016).

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

20575156340 is a wasteful number, since it uses less digits than its factorization.

20575156340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1028757826 (or 1028757824 counting only the distinct ones).

The product of its (nonzero) digits is 126000, while the sum is 38.

The spelling of 20575156340 in words is "twenty billion, five hundred seventy-five million, one hundred fifty-six thousand, three hundred forty".