20669915040768 has 660 divisors, whose sum is σ = 71875530978368. Its totient is φ = 5714994216960.

The previous prime is 20669915040751. The next prime is 20669915040793. The reversal of 20669915040768 is 86704051996602.

20669915040768 is a `hidden beast` number, since 2 + 0 + 6 + 69 + 9 + 1 + 504 + 0 + 7 + 68 = 666.

It is a super-2 number, since 2×20669915040768² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 685941030 + ... + 685971162.

Almost surely, 2^{20669915040768} is an apocalyptic number.

20669915040768 is a gapful number since it is divisible by the number (28) 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 20669915040768, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35937765489184).

20669915040768 is an abundant number, since it is smaller than the sum of its proper divisors (51205615937600).

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

20669915040768 is an equidigital number, since it uses as much as digits as its factorization.

20669915040768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30218 (or 30176 counting only the distinct ones).

The product of its (nonzero) digits is 39191040, while the sum is 63.

The spelling of 20669915040768 in words is "twenty trillion, six hundred sixty-nine billion, nine hundred fifteen million, forty thousand, seven hundred sixty-eight".