20456531365340 has 48 divisors (see below), whose sum is σ = 49097649775104. Its totient is φ = 7013385825600.

The previous prime is 20456531365337. The next prime is 20456531365343. The reversal of 20456531365340 is 4356313565402.

It is an interprime number because it is at equal distance from previous prime (20456531365337) and next prime (20456531365343).

It is a super-2 number, since 2×20456531365340² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20456531365343) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 570185 + ... + 6421695.

It is an arithmetic number, because the mean of its divisors is an integer number (1022867703648).

Almost surely, 2^{20456531365340} is an apocalyptic number.

20456531365340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20456531365340 is an abundant number, since it is smaller than the sum of its proper divisors (28641118409764).

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

20456531365340 is a wasteful number, since it uses less digits than its factorization.

20456531365340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5876498 (or 5876496 counting only the distinct ones).

The product of its (nonzero) digits is 3888000, while the sum is 47.

The spelling of 20456531365340 in words is "twenty trillion, four hundred fifty-six billion, five hundred thirty-one million, three hundred sixty-five thousand, three hundred forty".