20995353572 has 12 divisors (see below), whose sum is σ = 37010058540. Its totient is φ = 10421051136.

The previous prime is 20995353569. The next prime is 20995353637. The reversal of 20995353572 is 27535359902.

It can be written as a sum of positive squares in 2 ways, for example, as 16593561856 + 4401791716 = 128816^2 + 66346^2 .

It is a super-2 number, since 2×20995353572² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20995353572.

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, 19155797 + ... + 19156892.

It is an arithmetic number, because the mean of its divisors is an integer number (3084171545).

Almost surely, 2^20995353572 is an apocalyptic number.

It is an amenable number.

20995353572 is a deficient number, since it is larger than the sum of its proper divisors (16014704968).

20995353572 is a wasteful number, since it uses less digits than its factorization.

20995353572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38312830 (or 38312828 counting only the distinct ones).

The product of its (nonzero) digits is 2551500, while the sum is 50.

The spelling of 20995353572 in words is "twenty billion, nine hundred ninety-five million, three hundred fifty-three thousand, five hundred seventy-two".