20501766 has 12 divisors (see below), whose sum is σ = 44420532. Its totient is φ = 6833916.

The previous prime is 20501759. The next prime is 20501771. The reversal of 20501766 is 66710502.

It is a congruent number.

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 5 ways as a sum of consecutive naturals, for example, 569476 + ... + 569511.

It is an arithmetic number, because the mean of its divisors is an integer number (3701711).

Almost surely, 2^20501766 is an apocalyptic number.

20501766 is an abundant number, since it is smaller than the sum of its proper divisors (23918766).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20501766 is a wasteful number, since it uses less digits than its factorization.

20501766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1138995 (or 1138992 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 20501766 is about 4527.8875869438. The cubic root of 20501766 is about 273.6930425067.

The spelling of 20501766 in words is "twenty million, five hundred one thousand, seven hundred sixty-six".