20454767231 has 4 divisors (see below), whose sum is σ = 21114598464. Its totient is φ = 19794936000.

The previous prime is 20454767209. The next prime is 20454767237. The reversal of 20454767231 is 13276745402.

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 20454767231 - 2¹⁸ = 20454505087 is a prime.

It is a super-2 number, since 2×20454767231² (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 (20454767237) 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, 329915570 + ... + 329915631.

It is an arithmetic number, because the mean of its divisors is an integer number (5278649616).

Almost surely, 2^20454767231 is an apocalyptic number.

20454767231 is a deficient number, since it is larger than the sum of its proper divisors (659831233).

20454767231 is an equidigital number, since it uses as much as digits as its factorization.

20454767231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 659831232.

The product of its (nonzero) digits is 282240, while the sum is 41.

The spelling of 20454767231 in words is "twenty billion, four hundred fifty-four million, seven hundred sixty-seven thousand, two hundred thirty-one".