20831526340 has 12 divisors (see below), whose sum is σ = 43746205356. Its totient is φ = 8332610528.

The previous prime is 20831526329. The next prime is 20831526341. The reversal of 20831526340 is 4362513802.

It can be written as a sum of positive squares in 2 ways, for example, as 12633310404 + 8198215936 = 112398^2 + 90544^2 .

It is a super-2 number, since 2×20831526340² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20831526296 and 20831526305.

It is not an unprimeable number, because it can be changed into a prime (20831526341) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 520788139 + ... + 520788178.

It is an arithmetic number, because the mean of its divisors is an integer number (3645517113).

Almost surely, 2^20831526340 is an apocalyptic number.

20831526340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20831526340 is an abundant number, since it is smaller than the sum of its proper divisors (22914679016).

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

20831526340 is a wasteful number, since it uses less digits than its factorization.

20831526340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1041576326 (or 1041576324 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 34.

The spelling of 20831526340 in words is "twenty billion, eight hundred thirty-one million, five hundred twenty-six thousand, three hundred forty".