20311032340 has 24 divisors (see below), whose sum is σ = 43805957832. Its totient is φ = 7904833920.

The previous prime is 20311032317. The next prime is 20311032341. The reversal of 20311032340 is 4323011302.

It can be written as a sum of positive squares in 4 ways, for example, as 6965237764 + 13345794576 = 83458^2 + 115524^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20311032341) 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, 13722931 + ... + 13724410.

It is an arithmetic number, because the mean of its divisors is an integer number (1825248243).

Almost surely, 2^20311032340 is an apocalyptic number.

20311032340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20311032340 is an abundant number, since it is smaller than the sum of its proper divisors (23494925492).

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

20311032340 is a wasteful number, since it uses less digits than its factorization.

20311032340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27447387 (or 27447385 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 20311032340 its reverse (4323011302), we get a palindrome (24634043642).

The spelling of 20311032340 in words is "twenty billion, three hundred eleven million, thirty-two thousand, three hundred forty".