20514979 has 2 divisors, whose sum is σ = 20514980. Its totient is φ = 20514978.

The previous prime is 20514947. The next prime is 20515007. The reversal of 20514979 is 97941502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20514979 - 2⁵ = 20514947 is a prime.

It is not a weakly prime, because it can be changed into another prime (20514079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10257489 + 10257490.

It is an arithmetic number, because the mean of its divisors is an integer number (10257490).

Almost surely, 2^20514979 is an apocalyptic number.

20514979 is a deficient number, since it is larger than the sum of its proper divisors (1).

20514979 is an equidigital number, since it uses as much as digits as its factorization.

20514979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22680, while the sum is 37.

The square root of 20514979 is about 4529.3464208426. The cubic root of 20514979 is about 273.7518265413.

The spelling of 20514979 in words is "twenty million, five hundred fourteen thousand, nine hundred seventy-nine".