20493497 has 2 divisors, whose sum is σ = 20493498. Its totient is φ = 20493496.

The previous prime is 20493493. The next prime is 20493503. The reversal of 20493497 is 79439402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18800896 + 1692601 = 4336^2 + 1301^2 .

It is a cyclic number.

It is not a de Polignac number, because 20493497 - 2² = 20493493 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20493497.

It is not a weakly prime, because it can be changed into another prime (20493493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10246748 + 10246749.

It is an arithmetic number, because the mean of its divisors is an integer number (10246749).

Almost surely, 2^20493497 is an apocalyptic number.

It is an amenable number.

20493497 is a deficient number, since it is larger than the sum of its proper divisors (1).

20493497 is an equidigital number, since it uses as much as digits as its factorization.

20493497 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 38.

The square root of 20493497 is about 4526.9743758939. The cubic root of 20493497 is about 273.6562412525.

The spelling of 20493497 in words is "twenty million, four hundred ninety-three thousand, four hundred ninety-seven".