20547479 has 2 divisors, whose sum is σ = 20547480. Its totient is φ = 20547478.

The previous prime is 20547467. The next prime is 20547503. The reversal of 20547479 is 97474502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20547479 - 2⁴ = 20547463 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20547409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10273739 + 10273740.

It is an arithmetic number, because the mean of its divisors is an integer number (10273740).

Almost surely, 2^20547479 is an apocalyptic number.

20547479 is a deficient number, since it is larger than the sum of its proper divisors (1).

20547479 is an equidigital number, since it uses as much as digits as its factorization.

20547479 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 70560, while the sum is 38.

The square root of 20547479 is about 4532.9327151415. The cubic root of 20547479 is about 273.8963102426.

The spelling of 20547479 in words is "twenty million, five hundred forty-seven thousand, four hundred seventy-nine".