20966955 has 16 divisors (see below), whose sum is σ = 33630720. Its totient is φ = 11154528.

The previous prime is 20966951. The next prime is 20966969. The reversal of 20966955 is 55966902.

It is not a de Polignac number, because 20966955 - 2² = 20966951 is a prime.

It is a super-2 number, since 2×20966955² = 879226403944050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20966951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5436 + ... + 8454.

It is an arithmetic number, because the mean of its divisors is an integer number (2101920).

Almost surely, 2^20966955 is an apocalyptic number.

20966955 is a deficient number, since it is larger than the sum of its proper divisors (12663765).

20966955 is a wasteful number, since it uses less digits than its factorization.

20966955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3490.

The product of its (nonzero) digits is 145800, while the sum is 42.

The square root of 20966955 is about 4578.9687703674. The cubic root of 20966955 is about 275.7476295248.

The spelling of 20966955 in words is "twenty million, nine hundred sixty-six thousand, nine hundred fifty-five".