20104717391 has 16 divisors (see below), whose sum is σ = 22405271328. Its totient is φ = 17886019200.

The previous prime is 20104717363. The next prime is 20104717421. The reversal of 20104717391 is 19371740102.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20104717391 is a prime.

It is a super-2 number, since 2×20104717391² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20104717991) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56141 + ... + 208233.

It is an arithmetic number, because the mean of its divisors is an integer number (1400329458).

Almost surely, 2^20104717391 is an apocalyptic number.

20104717391 is a deficient number, since it is larger than the sum of its proper divisors (2300553937).

20104717391 is a wasteful number, since it uses less digits than its factorization.

20104717391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152362.

The product of its (nonzero) digits is 10584, while the sum is 35.

The spelling of 20104717391 in words is "twenty billion, one hundred four million, seven hundred seventeen thousand, three hundred ninety-one".