20381731397 has 8 divisors (see below), whose sum is σ = 20579857056. Its totient is φ = 20183747472.

The previous prime is 20381731393. The next prime is 20381731481. The reversal of 20381731397 is 79313718302.

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

It is a cyclic number.

It is not a de Polignac number, because 20381731397 - 2² = 20381731393 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20381731393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 265943 + ... + 333899.

It is an arithmetic number, because the mean of its divisors is an integer number (2572482132).

Almost surely, 2^20381731397 is an apocalyptic number.

It is an amenable number.

20381731397 is a deficient number, since it is larger than the sum of its proper divisors (198125659).

20381731397 is a wasteful number, since it uses less digits than its factorization.

20381731397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70867.

The product of its (nonzero) digits is 190512, while the sum is 44.

The spelling of 20381731397 in words is "twenty billion, three hundred eighty-one million, seven hundred thirty-one thousand, three hundred ninety-seven".