20402319157 has 16 divisors (see below), whose sum is σ = 23589662400. Its totient is φ = 17439235840.

The previous prime is 20402319151. The next prime is 20402319169. The reversal of 20402319157 is 75191320402.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20402319157 - 2⁷ = 20402319029 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20402319151) 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, 137019 + ... + 244087.

It is an arithmetic number, because the mean of its divisors is an integer number (1474353900).

Almost surely, 2^20402319157 is an apocalyptic number.

It is an amenable number.

20402319157 is a deficient number, since it is larger than the sum of its proper divisors (3187343243).

20402319157 is a wasteful number, since it uses less digits than its factorization.

20402319157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108116.

The product of its (nonzero) digits is 15120, while the sum is 34.

Adding to 20402319157 its reverse (75191320402), we get a palindrome (95593639559).

The spelling of 20402319157 in words is "twenty billion, four hundred two million, three hundred nineteen thousand, one hundred fifty-seven".