20257678 has 24 divisors (see below), whose sum is σ = 35503704. Its totient is φ = 8643600.

The previous prime is 20257669. The next prime is 20257697. The reversal of 20257678 is 87675202.

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 41013 + ... + 41503.

It is an arithmetic number, because the mean of its divisors is an integer number (1479321).

Almost surely, 2^20257678 is an apocalyptic number.

20257678 is a deficient number, since it is larger than the sum of its proper divisors (15246026).

20257678 is a wasteful number, since it uses less digits than its factorization.

20257678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 928 (or 921 counting only the distinct ones).

The product of its (nonzero) digits is 47040, while the sum is 37.

The square root of 20257678 is about 4500.8530302599. The cubic root of 20257678 is about 272.6025335889.

The spelling of 20257678 in words is "twenty million, two hundred fifty-seven thousand, six hundred seventy-eight".