20132431440 has 160 divisors (see below), whose sum is σ = 69667969536. Its totient is φ = 4767060480.

The previous prime is 20132431427. The next prime is 20132431469. The reversal of 20132431440 is 4413423102.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 20132431440.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 24847 + ... + 202193.

Almost surely, 2^20132431440 is an apocalyptic number.

20132431440 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 20132431440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34833984768).

20132431440 is an abundant number, since it is smaller than the sum of its proper divisors (49535538096).

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

20132431440 is a wasteful number, since it uses less digits than its factorization.

20132431440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177417 (or 177411 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 20132431440 its reverse (4413423102), we get a palindrome (24545854542).

The spelling of 20132431440 in words is "twenty billion, one hundred thirty-two million, four hundred thirty-one thousand, four hundred forty".