20352402721 has 8 divisors (see below), whose sum is σ = 23261765760. Its totient is φ = 17443508928.

The previous prime is 20352402677. The next prime is 20352402727. The reversal of 20352402721 is 12720425302.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20352402721 - 2⁷ = 20352402593 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20352402721.

It is not an unprimeable number, because it can be changed into a prime (20352402727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18856 + ... + 202633.

It is an arithmetic number, because the mean of its divisors is an integer number (2907720720).

Almost surely, 2^20352402721 is an apocalyptic number.

It is an amenable number.

20352402721 is a deficient number, since it is larger than the sum of its proper divisors (2909363039).

20352402721 is a wasteful number, since it uses less digits than its factorization.

20352402721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234623.

The product of its (nonzero) digits is 6720, while the sum is 28.

The spelling of 20352402721 in words is "twenty billion, three hundred fifty-two million, four hundred two thousand, seven hundred twenty-one".