20981626834734 has 48 divisors (see below), whose sum is σ = 45517071974400. Its totient is φ = 6985129909968.

The previous prime is 20981626834709. The next prime is 20981626834739. The reversal of 20981626834734 is 43743862618902.

20981626834734 is a `hidden beast` number, since 2 + 0 + 9 + 81 + 6 + 2 + 6 + 83 + 473 + 4 = 666.

It is a hoax number, since the sum of its digits (63) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20981626834739) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 49123507 + ... + 49548785.

It is an arithmetic number, because the mean of its divisors is an integer number (948272332800).

Almost surely, 2^{20981626834734} is an apocalyptic number.

20981626834734 is an abundant number, since it is smaller than the sum of its proper divisors (24535445139666).

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

20981626834734 is a wasteful number, since it uses less digits than its factorization.

20981626834734 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 428709 (or 428706 counting only the distinct ones).

The product of its (nonzero) digits is 83607552, while the sum is 63.

The spelling of 20981626834734 in words is "twenty trillion, nine hundred eighty-one billion, six hundred twenty-six million, eight hundred thirty-four thousand, seven hundred thirty-four".