20502479 has 2 divisors, whose sum is σ = 20502480. Its totient is φ = 20502478.

The previous prime is 20502401. The next prime is 20502491. The reversal of 20502479 is 97420502.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20502479 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20502179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10251239 + 10251240.

It is an arithmetic number, because the mean of its divisors is an integer number (10251240).

Almost surely, 2^20502479 is an apocalyptic number.

20502479 is a deficient number, since it is larger than the sum of its proper divisors (1).

20502479 is an equidigital number, since it uses as much as digits as its factorization.

20502479 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 20502479 is about 4527.9663205461. The cubic root of 20502479 is about 273.6962152558.

The spelling of 20502479 in words is "twenty million, five hundred two thousand, four hundred seventy-nine".