20623212979 has 2 divisors, whose sum is σ = 20623212980. Its totient is φ = 20623212978.

The previous prime is 20623212949. The next prime is 20623213123. The reversal of 20623212979 is 97921232602.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20623212979 - 2⁷ = 20623212851 is a prime.

It is not a weakly prime, because it can be changed into another prime (20623212949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10311606489 + 10311606490.

It is an arithmetic number, because the mean of its divisors is an integer number (10311606490).

Almost surely, 2^20623212979 is an apocalyptic number.

20623212979 is a deficient number, since it is larger than the sum of its proper divisors (1).

20623212979 is an equidigital number, since it uses as much as digits as its factorization.

20623212979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 163296, while the sum is 43.

The spelling of 20623212979 in words is "twenty billion, six hundred twenty-three million, two hundred twelve thousand, nine hundred seventy-nine".