20495394969856 has 81 divisors (see below), whose sum is σ = 41351013815139. Its totient is φ = 10138574241792.

The previous prime is 20495394969817. The next prime is 20495394969859. The reversal of 20495394969856 is 65896949359402.

The square root of 20495394969856 is 4527184.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 8451718809856 + 12043676160000 = 2907184^2 + 3470400^2 .

It is a super-2 number, since 2×20495394969856² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20495394969859) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 7026188110 + ... + 7026191026.

Almost surely, 2^{20495394969856} is an apocalyptic number.

20495394969856 is the 4527184-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20495394969856

20495394969856 is an abundant number, since it is smaller than the sum of its proper divisors (20855618845283).

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

20495394969856 is an frugal number, since it uses more digits than its factorization.

20495394969856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6044 (or 3016 counting only the distinct ones).

The product of its (nonzero) digits is 4534963200, while the sum is 79.

The spelling of 20495394969856 in words is "twenty trillion, four hundred ninety-five billion, three hundred ninety-four million, nine hundred sixty-nine thousand, eight hundred fifty-six".