20651515157 has 32 divisors (see below), whose sum is σ = 25977772800. Its totient is φ = 16313330880.

The previous prime is 20651515121. The next prime is 20651515217. The reversal of 20651515157 is 75151515602.

It is a happy number.

It is not a de Polignac number, because 20651515157 - 2⁸ = 20651514901 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20651515157.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20651515457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3042107 + ... + 3048887.

It is an arithmetic number, because the mean of its divisors is an integer number (811805400).

Almost surely, 2^20651515157 is an apocalyptic number.

It is an amenable number.

20651515157 is a deficient number, since it is larger than the sum of its proper divisors (5326257643).

20651515157 is an equidigital number, since it uses as much as digits as its factorization.

20651515157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7498 (or 7484 counting only the distinct ones).

The product of its (nonzero) digits is 52500, while the sum is 38.

The spelling of 20651515157 in words is "twenty billion, six hundred fifty-one million, five hundred fifteen thousand, one hundred fifty-seven".