20836156247 has 8 divisors (see below), whose sum is σ = 20981109456. Its totient is φ = 20691358272.

The previous prime is 20836156217. The next prime is 20836156249. The reversal of 20836156247 is 74265163802.

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-20836156247 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20836156198 and 20836156207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20836156249) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 237368 + ... + 313074.

It is an arithmetic number, because the mean of its divisors is an integer number (2622638682).

Almost surely, 2^20836156247 is an apocalyptic number.

20836156247 is a deficient number, since it is larger than the sum of its proper divisors (144953209).

20836156247 is a wasteful number, since it uses less digits than its factorization.

20836156247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77617.

The product of its (nonzero) digits is 483840, while the sum is 44.

The spelling of 20836156247 in words is "twenty billion, eight hundred thirty-six million, one hundred fifty-six thousand, two hundred forty-seven".