20823280 has 40 divisors (see below), whose sum is σ = 50523552. Its totient is φ = 7966464.

The previous prime is 20823269. The next prime is 20823287. The reversal of 20823280 is 8232802.

It is a tau number, because it is divible by the number of its divisors (40).

It is a hoax number, since the sum of its digits (25) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20823287) 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, 3819 + ... + 7498.

Almost surely, 2^20823280 is an apocalyptic number.

20823280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20823280 is an abundant number, since it is smaller than the sum of its proper divisors (29700272).

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

20823280 is a wasteful number, since it uses less digits than its factorization.

20823280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11353 (or 11347 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 25.

The square root of 20823280 is about 4563.2532254960. The cubic root of 20823280 is about 275.1163364528.

The spelling of 20823280 in words is "twenty million, eight hundred twenty-three thousand, two hundred eighty".