20560557 has 8 divisors (see below), whose sum is σ = 28082880. Its totient is φ = 13372640.

The previous prime is 20560537. The next prime is 20560571. The reversal of 20560557 is 75506502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20560557 - 2⁸ = 20560301 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20560517) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83457 + ... + 83702.

It is an arithmetic number, because the mean of its divisors is an integer number (3510360).

Almost surely, 2^20560557 is an apocalyptic number.

It is an amenable number.

20560557 is a deficient number, since it is larger than the sum of its proper divisors (7522323).

20560557 is a wasteful number, since it uses less digits than its factorization.

20560557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167203.

The product of its (nonzero) digits is 10500, while the sum is 30.

The square root of 20560557 is about 4534.3750396278. The cubic root of 20560557 is about 273.9544074956.

The spelling of 20560557 in words is "twenty million, five hundred sixty thousand, five hundred fifty-seven".