20824965 has 32 divisors (see below), whose sum is σ = 42312960. Its totient is φ = 9519552.

The previous prime is 20824961. The next prime is 20824981. The reversal of 20824965 is 56942802.

It is a happy number.

It is not a de Polignac number, because 20824965 - 2² = 20824961 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20824961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10074 + ... + 11963.

It is an arithmetic number, because the mean of its divisors is an integer number (1322280).

Almost surely, 2^20824965 is an apocalyptic number.

It is an amenable number.

20824965 is an abundant number, since it is smaller than the sum of its proper divisors (21487995).

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

20824965 is a wasteful number, since it uses less digits than its factorization.

20824965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22058 (or 22052 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 20824965 is about 4563.4378488153. The cubic root of 20824965 is about 275.1237569700.

The spelling of 20824965 in words is "twenty million, eight hundred twenty-four thousand, nine hundred sixty-five".