20650805 has 24 divisors (see below), whose sum is σ = 29767680. Its totient is φ = 13698720.

The previous prime is 20650789. The next prime is 20650811. The reversal of 20650805 is 50805602.

It is not a de Polignac number, because 20650805 - 2⁴ = 20650789 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6236 + ... + 8954.

It is an arithmetic number, because the mean of its divisors is an integer number (1240320).

Almost surely, 2^20650805 is an apocalyptic number.

It is an amenable number.

20650805 is a deficient number, since it is larger than the sum of its proper divisors (9116875).

20650805 is a wasteful number, since it uses less digits than its factorization.

20650805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2769 (or 2762 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 20650805 is about 4544.3156800557. The cubic root of 20650805 is about 274.3546520230.

The spelling of 20650805 in words is "twenty million, six hundred fifty thousand, eight hundred five".