20395629897 has 16 divisors (see below), whose sum is σ = 27428290560. Its totient is φ = 13480184592.

The previous prime is 20395629869. The next prime is 20395629901. The reversal of 20395629897 is 79892659302.

It is not a de Polignac number, because 20395629897 - 2¹⁰ = 20395628873 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20395629897.

It is not an unprimeable number, because it can be changed into a prime (20395629817) 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, 523354 + ... + 560972.

It is an arithmetic number, because the mean of its divisors is an integer number (1714268160).

Almost surely, 2^20395629897 is an apocalyptic number.

It is an amenable number.

20395629897 is a deficient number, since it is larger than the sum of its proper divisors (7032660663).

20395629897 is a wasteful number, since it uses less digits than its factorization.

20395629897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39172.

The product of its (nonzero) digits is 14696640, while the sum is 60.

The spelling of 20395629897 in words is "twenty billion, three hundred ninety-five million, six hundred twenty-nine thousand, eight hundred ninety-seven".