20508197995 has 8 divisors (see below), whose sum is σ = 24623886816. Its totient is φ = 16397192256.

The previous prime is 20508197993. The next prime is 20508198001. The reversal of 20508197995 is 59979180502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20508197995 - 2¹ = 20508197993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20508197993) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1161127 + ... + 1178656.

It is an arithmetic number, because the mean of its divisors is an integer number (3077985852).

Almost surely, 2^20508197995 is an apocalyptic number.

20508197995 is a deficient number, since it is larger than the sum of its proper divisors (4115688821).

20508197995 is a wasteful number, since it uses less digits than its factorization.

20508197995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2341541.

The product of its (nonzero) digits is 2041200, while the sum is 55.

The spelling of 20508197995 in words is "twenty billion, five hundred eight million, one hundred ninety-seven thousand, nine hundred ninety-five".