20357200621 has 8 divisors (see below), whose sum is σ = 21019002624. Its totient is φ = 19695718560.

The previous prime is 20357200601. The next prime is 20357200627. The reversal of 20357200621 is 12600275302.

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

It is not a de Polignac number, because 20357200621 - 2⁹ = 20357200109 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 20357200621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20357200627) 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, 52866 + ... + 208588.

It is an arithmetic number, because the mean of its divisors is an integer number (2627375328).

Almost surely, 2^20357200621 is an apocalyptic number.

It is an amenable number.

20357200621 is a deficient number, since it is larger than the sum of its proper divisors (661802003).

20357200621 is a wasteful number, since it uses less digits than its factorization.

20357200621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159971.

The product of its (nonzero) digits is 5040, while the sum is 28.

Adding to 20357200621 its reverse (12600275302), we get a palindrome (32957475923).

The spelling of 20357200621 in words is "twenty billion, three hundred fifty-seven million, two hundred thousand, six hundred twenty-one".