20915970395 has 4 divisors (see below), whose sum is σ = 25099164480. Its totient is φ = 16732776312.

The previous prime is 20915970371. The next prime is 20915970457. The reversal of 20915970395 is 59307951902.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 20915970395 - 2¹² = 20915966299 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2091597035 + ... + 2091597044.

It is an arithmetic number, because the mean of its divisors is an integer number (6274791120).

Almost surely, 2^20915970395 is an apocalyptic number.

20915970395 is a deficient number, since it is larger than the sum of its proper divisors (4183194085).

20915970395 is an equidigital number, since it uses as much as digits as its factorization.

20915970395 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4183194084.

The product of its (nonzero) digits is 765450, while the sum is 50.

The spelling of 20915970395 in words is "twenty billion, nine hundred fifteen million, nine hundred seventy thousand, three hundred ninety-five".