20497266 has 16 divisors (see below), whose sum is σ = 45549600. Its totient is φ = 6832404.

The previous prime is 20497247. The next prime is 20497271. The reversal of 20497266 is 66279402.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 20497266.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 189736 + ... + 189843.

It is an arithmetic number, because the mean of its divisors is an integer number (2846850).

Almost surely, 2^20497266 is an apocalyptic number.

20497266 is an abundant number, since it is smaller than the sum of its proper divisors (25052334).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20497266 is a wasteful number, since it uses less digits than its factorization.

20497266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 379590 (or 379584 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 36.

The square root of 20497266 is about 4527.3906392093. The cubic root of 20497266 is about 273.6730164463.

The spelling of 20497266 in words is "twenty million, four hundred ninety-seven thousand, two hundred sixty-six".