20181736157 has 16 divisors (see below), whose sum is σ = 22828646400. Its totient is φ = 17675506800.

The previous prime is 20181736129. The next prime is 20181736163. The reversal of 20181736157 is 75163718102.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20181736157 - 2²⁰ = 20180687581 is a prime.

It is a super-2 number, since 2×20181736157² (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 (20181736177) 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, 56657 + ... + 208742.

It is an arithmetic number, because the mean of its divisors is an integer number (1426790400).

Almost surely, 2^20181736157 is an apocalyptic number.

It is an amenable number.

20181736157 is a deficient number, since it is larger than the sum of its proper divisors (2646910243).

20181736157 is a wasteful number, since it uses less digits than its factorization.

20181736157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265664.

The product of its (nonzero) digits is 70560, while the sum is 41.

The spelling of 20181736157 in words is "twenty billion, one hundred eighty-one million, seven hundred thirty-six thousand, one hundred fifty-seven".