20106578 has 4 divisors (see below), whose sum is σ = 30159870. Its totient is φ = 10053288.

The previous prime is 20106521. The next prime is 20106589. The reversal of 20106578 is 87560102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 16507969 + 3598609 = 4063^2 + 1897^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20106578.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5026643 + ... + 5026646.

Almost surely, 2^20106578 is an apocalyptic number.

20106578 is a deficient number, since it is larger than the sum of its proper divisors (10053292).

20106578 is a wasteful number, since it uses less digits than its factorization.

20106578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10053291.

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 20106578 is about 4484.0359052978. The cubic root of 20106578 is about 271.9230697230.

The spelling of 20106578 in words is "twenty million, one hundred six thousand, five hundred seventy-eight".