20431213040 has 40 divisors (see below), whose sum is σ = 54288653280. Its totient is φ = 7004987136.

The previous prime is 20431213021. The next prime is 20431213043. The reversal of 20431213040 is 4031213402.

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 not an unprimeable number, because it can be changed into a prime (20431213043) 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, 18241595 + ... + 18242714.

It is an arithmetic number, because the mean of its divisors is an integer number (1357216332).

Almost surely, 2^20431213040 is an apocalyptic number.

20431213040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20431213040 is an abundant number, since it is smaller than the sum of its proper divisors (33857440240).

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

20431213040 is a wasteful number, since it uses less digits than its factorization.

20431213040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36484329 (or 36484323 counting only the distinct ones).

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

Adding to 20431213040 its reverse (4031213402), we get a palindrome (24462426442).

The spelling of 20431213040 in words is "twenty billion, four hundred thirty-one million, two hundred thirteen thousand, forty".