20277013664 has 12 divisors (see below), whose sum is σ = 39920370714. Its totient is φ = 10138506816.

The previous prime is 20277013637. The next prime is 20277013697. The reversal of 20277013664 is 46631077202.

It can be written as a sum of positive squares in only one way, i.e., 19462482064 + 814531600 = 139508^2 + 28540^2 .

It is a super-2 number, since 2×20277013664² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 316828307 + ... + 316828370.

Almost surely, 2^20277013664 is an apocalyptic number.

It is an amenable number.

20277013664 is a deficient number, since it is larger than the sum of its proper divisors (19643357050).

20277013664 is an equidigital number, since it uses as much as digits as its factorization.

20277013664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 633656687 (or 633656679 counting only the distinct ones).

The product of its (nonzero) digits is 84672, while the sum is 38.

The spelling of 20277013664 in words is "twenty billion, two hundred seventy-seven million, thirteen thousand, six hundred sixty-four".