20787295684 has 9 divisors (see below), whose sum is σ = 36378272077. Its totient is φ = 10393503664.

The previous prime is 20787295657. The next prime is 20787295703. The reversal of 20787295684 is 48659278702.

It is a happy number.

The square root of 20787295684 is 144178.

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

It can be written as a sum of positive squares in only one way, i.e., 15931993284 + 4855302400 = 126222^2 + 69680^2 .

It is a super-2 number, since 2×20787295684² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 252312 + ... + 324400.

Almost surely, 2^20787295684 is an apocalyptic number.

20787295684 is the 144178-th square number.

It is an amenable number.

20787295684 is a deficient number, since it is larger than the sum of its proper divisors (15590976393).

20787295684 is an frugal number, since it uses more digits than its factorization.

20787295684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144182 (or 72091 counting only the distinct ones).

The product of its (nonzero) digits is 13547520, while the sum is 58.

The spelling of 20787295684 in words is "twenty billion, seven hundred eighty-seven million, two hundred ninety-five thousand, six hundred eighty-four".