20966995 has 16 divisors (see below), whose sum is σ = 29122560. Its totient is φ = 14193504.

The previous prime is 20966993. The next prime is 20967041. The reversal of 20966995 is 59966902.

It is a cyclic number.

It is not a de Polignac number, because 20966995 - 2¹ = 20966993 is a prime.

It is a super-2 number, since 2×20966995² = 879229758660050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20966993) 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, 1027 + ... + 6556.

It is an arithmetic number, because the mean of its divisors is an integer number (1820160).

Almost surely, 2^20966995 is an apocalyptic number.

20966995 is a deficient number, since it is larger than the sum of its proper divisors (8155565).

20966995 is an equidigital number, since it uses as much as digits as its factorization.

20966995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7674.

The product of its (nonzero) digits is 262440, while the sum is 46.

The square root of 20966995 is about 4578.9731381610. The cubic root of 20966995 is about 275.7478048785.

It can be divided in two parts, 2096699 and 5, that added together give a square (2096704 = 1448²).

The spelling of 20966995 in words is "twenty million, nine hundred sixty-six thousand, nine hundred ninety-five".