20898431233 has 4 divisors (see below), whose sum is σ = 21572574208. Its totient is φ = 20224288260.

The previous prime is 20898431149. The next prime is 20898431237. The reversal of 20898431233 is 33213489802.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20898431233 - 2²⁵ = 20864876801 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20898431233.

It is not an unprimeable number, because it can be changed into a prime (20898431237) 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, 337071441 + ... + 337071502.

It is an arithmetic number, because the mean of its divisors is an integer number (5393143552).

Almost surely, 2^20898431233 is an apocalyptic number.

It is an amenable number.

20898431233 is a deficient number, since it is larger than the sum of its proper divisors (674142975).

20898431233 is an equidigital number, since it uses as much as digits as its factorization.

20898431233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 674142974.

The product of its (nonzero) digits is 248832, while the sum is 43.

The spelling of 20898431233 in words is "twenty billion, eight hundred ninety-eight million, four hundred thirty-one thousand, two hundred thirty-three".