20357174981 has 8 divisors (see below), whose sum is σ = 23916121824. Its totient is φ = 17082943920.

The previous prime is 20357174969. The next prime is 20357174989. The reversal of 20357174981 is 18947175302.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20357174981 is a prime.

It is a super-2 number, since 2×20357174981² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20357174989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71178791 + ... + 71179076.

It is an arithmetic number, because the mean of its divisors is an integer number (2989515228).

Almost surely, 2^20357174981 is an apocalyptic number.

It is an amenable number.

20357174981 is a deficient number, since it is larger than the sum of its proper divisors (3558946843).

20357174981 is a wasteful number, since it uses less digits than its factorization.

20357174981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142357891.

The product of its (nonzero) digits is 423360, while the sum is 47.

The spelling of 20357174981 in words is "twenty billion, three hundred fifty-seven million, one hundred seventy-four thousand, nine hundred eighty-one".