20340607021 has 6 divisors (see below), whose sum is σ = 23661522510. Its totient is φ = 17434805976.

The previous prime is 20340606971. The next prime is 20340607051. The reversal of 20340607021 is 12070604302.

It can be written as a sum of positive squares in only one way, i.e., 19433754025 + 906852996 = 139405^2 + 30114^2 .

It is not a de Polignac number, because 20340607021 - 2¹⁵ = 20340574253 is a prime.

It is the 142621-st Hogben number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20340607051) by changing a digit.

It is a nontrivial repunit in base 142620.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 207557166 + ... + 207557263.

It is an arithmetic number, because the mean of its divisors is an integer number (3943587085).

Almost surely, 2^20340607021 is an apocalyptic number.

It is an amenable number.

20340607021 is a deficient number, since it is larger than the sum of its proper divisors (3320915489).

20340607021 is an equidigital number, since it uses as much as digits as its factorization.

20340607021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 415114443 (or 415114436 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 25.

The spelling of 20340607021 in words is "twenty billion, three hundred forty million, six hundred seven thousand, twenty-one".