20381355091885 has 16 divisors (see below), whose sum is σ = 24515189726976. Its totient is φ = 16266723124288.

The previous prime is 20381355091861. The next prime is 20381355091901. The reversal of 20381355091885 is 58819055318302.

It is a cyclic number.

It is not a de Polignac number, because 20381355091885 - 2¹⁹ = 20381354567597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10129452 + ... + 11973658.

It is an arithmetic number, because the mean of its divisors is an integer number (1532199357936).

Almost surely, 2^{20381355091885} is an apocalyptic number.

It is an amenable number.

20381355091885 is a deficient number, since it is larger than the sum of its proper divisors (4133834635091).

20381355091885 is a wasteful number, since it uses less digits than its factorization.

20381355091885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1849412.

The product of its (nonzero) digits is 10368000, while the sum is 58.

The spelling of 20381355091885 in words is "twenty trillion, three hundred eighty-one billion, three hundred fifty-five million, ninety-one thousand, eight hundred eighty-five".