20655705 has 48 divisors (see below), whose sum is σ = 38905920. Its totient is φ = 9330048.

The previous prime is 20655689. The next prime is 20655707. The reversal of 20655705 is 50755602.

It is not a de Polignac number, because 20655705 - 2⁴ = 20655689 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20655707) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 115306 + ... + 115484.

It is an arithmetic number, because the mean of its divisors is an integer number (810540).

Almost surely, 2^20655705 is an apocalyptic number.

It is an amenable number.

20655705 is a deficient number, since it is larger than the sum of its proper divisors (18250215).

20655705 is a wasteful number, since it uses less digits than its factorization.

20655705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 358 (or 351 counting only the distinct ones).

The product of its (nonzero) digits is 10500, while the sum is 30.

The square root of 20655705 is about 4544.8547831586. The cubic root of 20655705 is about 274.3763498290.

The spelling of 20655705 in words is "twenty million, six hundred fifty-five thousand, seven hundred five".