20780578 has 24 divisors (see below), whose sum is σ = 38579328. Its totient is φ = 8219952.

The previous prime is 20780549. The next prime is 20780581. The reversal of 20780578 is 87508702.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2026 + ... + 6757.

It is an arithmetic number, because the mean of its divisors is an integer number (1607472).

Almost surely, 2^20780578 is an apocalyptic number.

20780578 is a deficient number, since it is larger than the sum of its proper divisors (17798750).

20780578 is a wasteful number, since it uses less digits than its factorization.

20780578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8818 (or 8805 counting only the distinct ones).

The product of its (nonzero) digits is 31360, while the sum is 37.

The square root of 20780578 is about 4558.5719255047. The cubic root of 20780578 is about 274.9281487216.

The spelling of 20780578 in words is "twenty million, seven hundred eighty thousand, five hundred seventy-eight".