23012031440 has 40 divisors (see below), whose sum is σ = 53783129088. Its totient is φ = 9156613760.

The previous prime is 23012031421. The next prime is 23012031463. The reversal of 23012031440 is 4413021032.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 737732 + ... + 768291.

Almost surely, 2^23012031440 is an apocalyptic number.

23012031440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23012031440 is an abundant number, since it is smaller than the sum of its proper divisors (30771097648).

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

23012031440 is a wasteful number, since it uses less digits than its factorization.

23012031440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1506227 (or 1506221 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 23012031440 its reverse (4413021032), we get a palindrome (27425052472).

The spelling of 23012031440 in words is "twenty-three billion, twelve million, thirty-one thousand, four hundred forty".