20430715157 has 4 divisors (see below), whose sum is σ = 20611518060. Its totient is φ = 20249912256.

The previous prime is 20430715147. The next prime is 20430715159. The reversal of 20430715157 is 75151703402.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8026547281 + 12404167876 = 89591^2 + 111374^2 .

It is a cyclic number.

It is not a de Polignac number, because 20430715157 - 2⁸ = 20430714901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20430715159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90401282 + ... + 90401507.

It is an arithmetic number, because the mean of its divisors is an integer number (5152879515).

Almost surely, 2^20430715157 is an apocalyptic number.

It is an amenable number.

20430715157 is a deficient number, since it is larger than the sum of its proper divisors (180802903).

20430715157 is a wasteful number, since it uses less digits than its factorization.

20430715157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180802902.

The product of its (nonzero) digits is 29400, while the sum is 35.

The spelling of 20430715157 in words is "twenty billion, four hundred thirty million, seven hundred fifteen thousand, one hundred fifty-seven".