20750018 has 8 divisors (see below), whose sum is σ = 31884300. Its totient is φ = 10121920.

The previous prime is 20750017. The next prime is 20750027. The reversal of 20750018 is 81005702.

It can be written as a sum of positive squares in 2 ways, for example, as 20584369 + 165649 = 4537^2 + 407^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 20749975 and 20750002.

It is not an unprimeable number, because it can be changed into a prime (20750011) 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 3 ways as a sum of consecutive naturals, for example, 126443 + ... + 126606.

Almost surely, 2^20750018 is an apocalyptic number.

20750018 is a deficient number, since it is larger than the sum of its proper divisors (11134282).

20750018 is a wasteful number, since it uses less digits than its factorization.

20750018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 253092.

The product of its (nonzero) digits is 560, while the sum is 23.

The square root of 20750018 is about 4555.2187653284. The cubic root of 20750018 is about 274.7933124630.

The spelling of 20750018 in words is "twenty million, seven hundred fifty thousand, eighteen".