23203402240 has 80 divisors (see below), whose sum is σ = 56990961720. Its totient is φ = 9054945280.

The previous prime is 23203402231. The next prime is 23203402249. The reversal of 23203402240 is 4220430232.

It is an interprime number because it is at equal distance from previous prime (23203402231) and next prime (23203402249).

It can be written as a sum of positive squares in 4 ways, for example, as 20000747776 + 3202654464 = 141424^2 + 56592^2 .

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×23203402240² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (23203402249) 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, 5575 + ... + 215494.

Almost surely, 2^23203402240 is an apocalyptic number.

23203402240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 23203402240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28495480860).

23203402240 is an abundant number, since it is smaller than the sum of its proper divisors (33787559480).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

23203402240 is an equidigital number, since it uses as much as digits as its factorization.

23203402240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221133 (or 221117 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 22.

Adding to 23203402240 its reverse (4220430232), we get a palindrome (27423832472).

The spelling of 23203402240 in words is "twenty-three billion, two hundred three million, four hundred two thousand, two hundred forty".