20455120231 has 8 divisors (see below), whose sum is σ = 25175532704. Its totient is φ = 16184270880.

The previous prime is 20455120223. The next prime is 20455120249. The reversal of 20455120231 is 13202155402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20455120231 - 2³ = 20455120223 is a prime.

It is a super-2 number, since 2×20455120231² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20455120196 and 20455120205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20452120231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 112390680 + ... + 112390861.

It is an arithmetic number, because the mean of its divisors is an integer number (3146941588).

Almost surely, 2^20455120231 is an apocalyptic number.

20455120231 is a deficient number, since it is larger than the sum of its proper divisors (4720412473).

20455120231 is a wasteful number, since it uses less digits than its factorization.

20455120231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224781561.

The product of its (nonzero) digits is 2400, while the sum is 25.

Adding to 20455120231 its reverse (13202155402), we get a palindrome (33657275633).

The spelling of 20455120231 in words is "twenty billion, four hundred fifty-five million, one hundred twenty thousand, two hundred thirty-one".