20497279 has 6 divisors (see below), whose sum is σ = 22530200. Its totient is φ = 18633780.

The previous prime is 20497277. The next prime is 20497303. The reversal of 20497279 is 97279402.

It is not a de Polignac number, because 20497279 - 2¹ = 20497277 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20497271) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 84579 + ... + 84820.

Almost surely, 2^20497279 is an apocalyptic number.

20497279 is a deficient number, since it is larger than the sum of its proper divisors (2032921).

20497279 is a wasteful number, since it uses less digits than its factorization.

20497279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169421 (or 169410 counting only the distinct ones).

The product of its (nonzero) digits is 63504, while the sum is 40.

The square root of 20497279 is about 4527.3920749147. The cubic root of 20497279 is about 273.6730743036.

The spelling of 20497279 in words is "twenty million, four hundred ninety-seven thousand, two hundred seventy-nine".