20697249 has 16 divisors (see below), whose sum is σ = 28350720. Its totient is φ = 13424640.

The previous prime is 20697241. The next prime is 20697253. The reversal of 20697249 is 94279602.

It is not a de Polignac number, because 20697249 - 2³ = 20697241 is a prime.

It is a super-2 number, since 2×20697249² = 856752232336002, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20697241) 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, 31969 + ... + 32609.

It is an arithmetic number, because the mean of its divisors is an integer number (1771920).

Almost surely, 2^20697249 is an apocalyptic number.

It is an amenable number.

20697249 is a deficient number, since it is larger than the sum of its proper divisors (7653471).

20697249 is a wasteful number, since it uses less digits than its factorization.

20697249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 920.

The product of its (nonzero) digits is 54432, while the sum is 39.

The square root of 20697249 is about 4549.4229304385. The cubic root of 20697249 is about 274.5601740669.

The spelling of 20697249 in words is "twenty million, six hundred ninety-seven thousand, two hundred forty-nine".