20315215340 has 96 divisors (see below), whose sum is σ = 51507187200. Its totient is φ = 6574901760.

The previous prime is 20315215331. The next prime is 20315215351. The reversal of 20315215340 is 4351251302.

It is a happy number.

It is a super-3 number, since 3×20315215340³ (a number of 32 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 733871 + ... + 761049.

It is an arithmetic number, because the mean of its divisors is an integer number (536533200).

Almost surely, 2^20315215340 is an apocalyptic number.

20315215340 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 20315215340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25753593600).

20315215340 is an abundant number, since it is smaller than the sum of its proper divisors (31191971860).

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

20315215340 is a wasteful number, since it uses less digits than its factorization.

20315215340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27495 (or 27493 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 26.

Adding to 20315215340 its reverse (4351251302), we get a palindrome (24666466642).

The spelling of 20315215340 in words is "twenty billion, three hundred fifteen million, two hundred fifteen thousand, three hundred forty".