20007600721 has 4 divisors (see below), whose sum is σ = 20014665892. Its totient is φ = 20000535552.

The previous prime is 20007600673. The next prime is 20007600731. The reversal of 20007600721 is 12700670002.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2757405121 + 17250195600 = 52511^2 + 131340^2 .

It is a cyclic number.

It is not a de Polignac number, because 20007600721 - 2¹³ = 20007592529 is a prime.

It is a super-2 number, since 2×20007600721² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20007600731) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3528336 + ... + 3534001.

It is an arithmetic number, because the mean of its divisors is an integer number (5003666473).

Almost surely, 2^20007600721 is an apocalyptic number.

It is an amenable number.

20007600721 is a deficient number, since it is larger than the sum of its proper divisors (7065171).

20007600721 is an equidigital number, since it uses as much as digits as its factorization.

20007600721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7065170.

The product of its (nonzero) digits is 1176, while the sum is 25.

The spelling of 20007600721 in words is "twenty billion, seven million, six hundred thousand, seven hundred twenty-one".