20320404621 has 16 divisors (see below), whose sum is σ = 29683817280. Its totient is φ = 12262536320.

The previous prime is 20320404571. The next prime is 20320404641. The reversal of 20320404621 is 12640402302.

It is a cyclic number.

It is not a de Polignac number, because 20320404621 - 2¹⁹ = 20319880333 is a prime.

It is a super-2 number, since 2×20320404621² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20320404591 and 20320404600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20320404641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1313706 + ... + 1329083.

It is an arithmetic number, because the mean of its divisors is an integer number (1855238580).

Almost surely, 2^20320404621 is an apocalyptic number.

It is an amenable number.

20320404621 is a deficient number, since it is larger than the sum of its proper divisors (9363412659).

20320404621 is a wasteful number, since it uses less digits than its factorization.

20320404621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2643036.

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 20320404621 its reverse (12640402302), we get a palindrome (32960806923).

The spelling of 20320404621 in words is "twenty billion, three hundred twenty million, four hundred four thousand, six hundred twenty-one".