20312202440 has 32 divisors (see below), whose sum is σ = 46674852480. Its totient is φ = 7952010432.

The previous prime is 20312202433. The next prime is 20312202481. The reversal of 20312202440 is 4420221302.

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

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, 5400302 + ... + 5404061.

It is an arithmetic number, because the mean of its divisors is an integer number (1458589140).

Almost surely, 2^20312202440 is an apocalyptic number.

20312202440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20312202440 is an abundant number, since it is smaller than the sum of its proper divisors (26362650040).

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

20312202440 is a wasteful number, since it uses less digits than its factorization.

20312202440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10804421 (or 10804417 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

Adding to 20312202440 its reverse (4420221302), we get a palindrome (24732423742).

The spelling of 20312202440 in words is "twenty billion, three hundred twelve million, two hundred two thousand, four hundred forty".