20726663268340 has 12 divisors (see below), whose sum is σ = 43525992863556. Its totient is φ = 8290665307328.

The previous prime is 20726663268293. The next prime is 20726663268361. The reversal of 20726663268340 is 4386236662702.

It can be written as a sum of positive squares in 2 ways, for example, as 2691030270096 + 18035632998244 = 1640436^2 + 4246838^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 518166581689 + ... + 518166581728.

It is an arithmetic number, because the mean of its divisors is an integer number (3627166071963).

Almost surely, 2^{20726663268340} is an apocalyptic number.

20726663268340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20726663268340 is an abundant number, since it is smaller than the sum of its proper divisors (22799329595216).

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

20726663268340 is a wasteful number, since it uses less digits than its factorization.

20726663268340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1036333163426 (or 1036333163424 counting only the distinct ones).

The product of its (nonzero) digits is 20901888, while the sum is 55.

The spelling of 20726663268340 in words is "twenty trillion, seven hundred twenty-six billion, six hundred sixty-three million, two hundred sixty-eight thousand, three hundred forty".