20820008231 has 8 divisors (see below), whose sum is σ = 22878524304. Its totient is φ = 18789123520.

The previous prime is 20820008221. The next prime is 20820008257. The reversal of 20820008231 is 13280002802.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20820008231 is a prime.

It is a super-2 number, since 2×20820008231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20820008231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20820008201) 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, 6906260 + ... + 6909273.

It is an arithmetic number, because the mean of its divisors is an integer number (2859815538).

Almost surely, 2^20820008231 is an apocalyptic number.

20820008231 is a deficient number, since it is larger than the sum of its proper divisors (2058516073).

20820008231 is a wasteful number, since it uses less digits than its factorization.

20820008231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13815681.

The product of its (nonzero) digits is 1536, while the sum is 26.

The spelling of 20820008231 in words is "twenty billion, eight hundred twenty million, eight thousand, two hundred thirty-one".