20219539 has 2 divisors, whose sum is σ = 20219540. Its totient is φ = 20219538.

The previous prime is 20219531. The next prime is 20219557. The reversal of 20219539 is 93591202.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20219539 - 2³ = 20219531 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20219539.

It is not a weakly prime, because it can be changed into another prime (20219531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10109769 + 10109770.

It is an arithmetic number, because the mean of its divisors is an integer number (10109770).

Almost surely, 2^20219539 is an apocalyptic number.

20219539 is a deficient number, since it is larger than the sum of its proper divisors (1).

20219539 is an equidigital number, since it uses as much as digits as its factorization.

20219539 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4860, while the sum is 31.

The square root of 20219539 is about 4496.6141706844. The cubic root of 20219539 is about 272.4313504369.

The spelling of 20219539 in words is "twenty million, two hundred nineteen thousand, five hundred thirty-nine".