20824645 has 8 divisors (see below), whose sum is σ = 25109280. Its totient is φ = 16579920.

The previous prime is 20824633. The next prime is 20824649. The reversal of 20824645 is 54642802.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20824645 - 2⁵ = 20824613 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20824649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8815 + ... + 10924.

It is an arithmetic number, because the mean of its divisors is an integer number (3138660).

Almost surely, 2^20824645 is an apocalyptic number.

It is an amenable number.

20824645 is a deficient number, since it is larger than the sum of its proper divisors (4284635).

20824645 is a wasteful number, since it uses less digits than its factorization.

20824645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19955.

The product of its (nonzero) digits is 15360, while the sum is 31.

The square root of 20824645 is about 4563.4027873945. The cubic root of 20824645 is about 275.1223477631.

The spelling of 20824645 in words is "twenty million, eight hundred twenty-four thousand, six hundred forty-five".