20643401315 has 16 divisors (see below), whose sum is σ = 25304779200. Its totient is φ = 16162312320.

The previous prime is 20643401299. The next prime is 20643401353. The reversal of 20643401315 is 51310434602.

It is not a de Polignac number, because 20643401315 - 2⁴ = 20643401299 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 109364 + ... + 230753.

It is an arithmetic number, because the mean of its divisors is an integer number (1581548700).

Almost surely, 2^20643401315 is an apocalyptic number.

20643401315 is a deficient number, since it is larger than the sum of its proper divisors (4661377885).

20643401315 is a wasteful number, since it uses less digits than its factorization.

20643401315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340382.

The product of its (nonzero) digits is 8640, while the sum is 29.

Adding to 20643401315 its reverse (51310434602), we get a palindrome (71953835917).

The spelling of 20643401315 in words is "twenty billion, six hundred forty-three million, four hundred one thousand, three hundred fifteen".