20643031605413 has 16 divisors (see below), whose sum is σ = 24994419816960. Its totient is φ = 16643457390336.

The previous prime is 20643031605373. The next prime is 20643031605433. The reversal of 20643031605413 is 31450613034602.

It is not a de Polignac number, because 20643031605413 - 2¹⁰ = 20643031604389 is a prime.

It is a super-2 number, since 2×20643031605413² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20643031605433) 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, 50548781 + ... + 50955522.

It is an arithmetic number, because the mean of its divisors is an integer number (1562151238560).

Almost surely, 2^{20643031605413} is an apocalyptic number.

It is an amenable number.

20643031605413 is a deficient number, since it is larger than the sum of its proper divisors (4351388211547).

20643031605413 is a wasteful number, since it uses less digits than its factorization.

20643031605413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101506036.

The product of its (nonzero) digits is 155520, while the sum is 38.

The spelling of 20643031605413 in words is "twenty trillion, six hundred forty-three billion, thirty-one million, six hundred five thousand, four hundred thirteen".