20402234440 has 64 divisors (see below), whose sum is σ = 52631804160. Its totient is φ = 6972529920.

The previous prime is 20402234431. The next prime is 20402234441. The reversal of 20402234440 is 4443220402.

It is a super-2 number, since 2×20402234440² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20402234441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30067 + ... + 204226.

It is an arithmetic number, because the mean of its divisors is an integer number (822371940).

Almost surely, 2^20402234440 is an apocalyptic number.

20402234440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20402234440 is an abundant number, since it is smaller than the sum of its proper divisors (32229569720).

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

20402234440 is a wasteful number, since it uses less digits than its factorization.

20402234440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234622 (or 234618 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 25.

Adding to 20402234440 its reverse (4443220402), we get a palindrome (24845454842).

The spelling of 20402234440 in words is "twenty billion, four hundred two million, two hundred thirty-four thousand, four hundred forty".