20823408 has 60 divisors (see below), whose sum is σ = 59714928. Its totient is φ = 6769920.

The previous prime is 20823359. The next prime is 20823409. The reversal of 20823408 is 80432802.

It is a super-2 number, since 2×20823408² = 867228641468928, which contains 22 as substring.

It is a hoax number, since the sum of its digits (27) 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 (20823409) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4141 + ... + 7667.

Almost surely, 2^20823408 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20823408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29857464).

20823408 is an abundant number, since it is smaller than the sum of its proper divisors (38891520).

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

20823408 is a wasteful number, since it uses less digits than its factorization.

20823408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3582 (or 3573 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 20823408 is about 4563.2672505563. The cubic root of 20823408 is about 275.1169001620.

The spelling of 20823408 in words is "twenty million, eight hundred twenty-three thousand, four hundred eight".