20215896431 has 4 divisors (see below), whose sum is σ = 21279891000. Its totient is φ = 19151901864.

The previous prime is 20215896413. The next prime is 20215896473. The reversal of 20215896431 is 13469851202.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20215896431 - 2¹⁸ = 20215634287 is a prime.

It is a super-2 number, since 2×20215896431² (a number of 21 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 (20215896401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 531997256 + ... + 531997293.

It is an arithmetic number, because the mean of its divisors is an integer number (5319972750).

Almost surely, 2^20215896431 is an apocalyptic number.

20215896431 is a deficient number, since it is larger than the sum of its proper divisors (1063994569).

20215896431 is a wasteful number, since it uses less digits than its factorization.

20215896431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1063994568.

The product of its (nonzero) digits is 103680, while the sum is 41.

The spelling of 20215896431 in words is "twenty billion, two hundred fifteen million, eight hundred ninety-six thousand, four hundred thirty-one".