20996266 has 4 divisors (see below), whose sum is σ = 31494402. Its totient is φ = 10498132.

The previous prime is 20996251. The next prime is 20996293. The reversal of 20996266 is 66269902.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66269902 = 2 ⋅33134951.

It can be written as a sum of positive squares in only one way, i.e., 19105641 + 1890625 = 4371^2 + 1375^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5249065 + ... + 5249068.

Almost surely, 2^20996266 is an apocalyptic number.

20996266 is a deficient number, since it is larger than the sum of its proper divisors (10498136).

20996266 is a wasteful number, since it uses less digits than its factorization.

20996266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10498135.

The product of its (nonzero) digits is 69984, while the sum is 40.

The square root of 20996266 is about 4582.1682640427. The cubic root of 20996266 is about 275.8760645690.

The spelling of 20996266 in words is "twenty million, nine hundred ninety-six thousand, two hundred sixty-six".