20866645012620 has 96 divisors (see below), whose sum is σ = 63739071083520. Its totient is φ = 5058504783360.

The previous prime is 20866645012601. The next prime is 20866645012651. The reversal of 20866645012620 is 2621054666802.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 20866645012620.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 52820349 + ... + 53213931.

It is an arithmetic number, because the mean of its divisors is an integer number (663948657120).

Almost surely, 2^{20866645012620} is an apocalyptic number.

20866645012620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20866645012620 is an abundant number, since it is smaller than the sum of its proper divisors (42872426070900).

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

20866645012620 is a wasteful number, since it uses less digits than its factorization.

20866645012620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 473935 (or 473933 counting only the distinct ones).

The product of its (nonzero) digits is 1658880, while the sum is 48.

The spelling of 20866645012620 in words is "twenty trillion, eight hundred sixty-six billion, six hundred forty-five million, twelve thousand, six hundred twenty".