20645022032540 has 24 divisors (see below), whose sum is σ = 44065276537632. Its totient is φ = 8122631618880.

The previous prime is 20645022032441. The next prime is 20645022032549. The reversal of 20645022032540 is 4523022054602.

It is a self number, because there is not a number n which added to its sum of digits gives 20645022032540.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20645022032549) 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, 8461073384 + ... + 8461075823.

It is an arithmetic number, because the mean of its divisors is an integer number (1836053189068).

Almost surely, 2^{20645022032540} is an apocalyptic number.

20645022032540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20645022032540 is an abundant number, since it is smaller than the sum of its proper divisors (23420254505092).

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

20645022032540 is a wasteful number, since it uses less digits than its factorization.

20645022032540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16922149277 (or 16922149275 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 35.

The spelling of 20645022032540 in words is "twenty trillion, six hundred forty-five billion, twenty-two million, thirty-two thousand, five hundred forty".