20192540391 has 12 divisors (see below), whose sum is σ = 29173954680. Its totient is φ = 13458485040.

The previous prime is 20192540371. The next prime is 20192540411. The reversal of 20192540391 is 19304529102.

20192540391 is a `hidden beast` number, since 2 + 0 + 19 + 254 + 0 + 391 = 666.

It is an interprime number because it is at equal distance from previous prime (20192540371) and next prime (20192540411).

It is not a de Polignac number, because 20192540391 - 2⁵ = 20192540359 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20192540371) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 227205 + ... + 303326.

It is an arithmetic number, because the mean of its divisors is an integer number (2431162890).

Almost surely, 2^20192540391 is an apocalyptic number.

20192540391 is a deficient number, since it is larger than the sum of its proper divisors (8981414289).

20192540391 is a wasteful number, since it uses less digits than its factorization.

20192540391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 534766 (or 534763 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The spelling of 20192540391 in words is "twenty billion, one hundred ninety-two million, five hundred forty thousand, three hundred ninety-one".