20750557 has 8 divisors (see below), whose sum is σ = 22035456. Its totient is φ = 19472832.

The previous prime is 20750539. The next prime is 20750567. The reversal of 20750557 is 75505702.

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 20750557 - 2¹¹ = 20748509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20750537) 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 in 7 ways as a sum of consecutive naturals, for example, 4918 + ... + 8104.

It is an arithmetic number, because the mean of its divisors is an integer number (2754432).

Almost surely, 2^20750557 is an apocalyptic number.

It is an amenable number.

20750557 is a deficient number, since it is larger than the sum of its proper divisors (1284899).

20750557 is a wasteful number, since it uses less digits than its factorization.

20750557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3587.

The product of its (nonzero) digits is 12250, while the sum is 31.

The square root of 20750557 is about 4555.2779278547. The cubic root of 20750557 is about 274.7956917752.

The spelling of 20750557 in words is "twenty million, seven hundred fifty thousand, five hundred fifty-seven".