20869966 has 32 divisors (see below), whose sum is σ = 35380800. Its totient is φ = 9166080.

The previous prime is 20869957. The next prime is 20869967. The reversal of 20869966 is 66996802.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20869967) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66951 + ... + 67261.

It is an arithmetic number, because the mean of its divisors is an integer number (1105650).

Almost surely, 2^20869966 is an apocalyptic number.

20869966 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

20869966 is a deficient number, since it is larger than the sum of its proper divisors (14510834).

20869966 is a wasteful number, since it uses less digits than its factorization.

20869966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 444.

The product of its (nonzero) digits is 279936, while the sum is 46.

The square root of 20869966 is about 4568.3657909585. The cubic root of 20869966 is about 275.3217875052.

The spelling of 20869966 in words is "twenty million, eight hundred sixty-nine thousand, nine hundred sixty-six".