20967755 has 4 divisors (see below), whose sum is σ = 25161312. Its totient is φ = 16774200.

The previous prime is 20967731. The next prime is 20967797. The reversal of 20967755 is 55776902.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20967755 - 2¹² = 20963659 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2096771 + ... + 2096780.

It is an arithmetic number, because the mean of its divisors is an integer number (6290328).

Almost surely, 2^20967755 is an apocalyptic number.

20967755 is a deficient number, since it is larger than the sum of its proper divisors (4193557).

20967755 is an equidigital number, since it uses as much as digits as its factorization.

20967755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4193556.

The product of its (nonzero) digits is 132300, while the sum is 41.

The square root of 20967755 is about 4579.0561254477. The cubic root of 20967755 is about 275.7511365560.

The spelling of 20967755 in words is "twenty million, nine hundred sixty-seven thousand, seven hundred fifty-five".