20163559 has 6 divisors (see below), whose sum is σ = 21834096. Its totient is φ = 18612360.

The previous prime is 20163551. The next prime is 20163593. The reversal of 20163559 is 95536102.

It is not a de Polignac number, because 20163559 - 2³ = 20163551 is a prime.

It is a super-2 number, since 2×20163559² = 813138223092962, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20163559.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20163551) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 59487 + ... + 59824.

It is an arithmetic number, because the mean of its divisors is an integer number (3639016).

Almost surely, 2^20163559 is an apocalyptic number.

20163559 is a deficient number, since it is larger than the sum of its proper divisors (1670537).

20163559 is a wasteful number, since it uses less digits than its factorization.

20163559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119337 (or 119324 counting only the distinct ones).

The product of its (nonzero) digits is 8100, while the sum is 31.

The square root of 20163559 is about 4490.3851727886. The cubic root of 20163559 is about 272.1796994126.

The spelling of 20163559 in words is "twenty million, one hundred sixty-three thousand, five hundred fifty-nine".