20641755 has 16 divisors (see below), whose sum is σ = 33083424. Its totient is φ = 10990080.

The previous prime is 20641739. The next prime is 20641769. The reversal of 20641755 is 55714602.

It is not a de Polignac number, because 20641755 - 2⁴ = 20641739 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15267 + ... + 16563.

It is an arithmetic number, because the mean of its divisors is an integer number (2067714).

Almost surely, 2^20641755 is an apocalyptic number.

20641755 is a deficient number, since it is larger than the sum of its proper divisors (12441669).

20641755 is a wasteful number, since it uses less digits than its factorization.

20641755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2366.

The product of its (nonzero) digits is 8400, while the sum is 30.

The square root of 20641755 is about 4543.3198214522. The cubic root of 20641755 is about 274.3145684783.

The spelling of 20641755 in words is "twenty million, six hundred forty-one thousand, seven hundred fifty-five".