20823454 has 4 divisors (see below), whose sum is σ = 31235184. Its totient is φ = 10411726.

The previous prime is 20823437. The next prime is 20823493. The reversal of 20823454 is 45432802.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 45432802 = 2 ⋅22716401.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5205862 + ... + 5205865.

It is an arithmetic number, because the mean of its divisors is an integer number (7808796).

Almost surely, 2^20823454 is an apocalyptic number.

20823454 is a deficient number, since it is larger than the sum of its proper divisors (10411730).

20823454 is a wasteful number, since it uses less digits than its factorization.

20823454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10411729.

The product of its (nonzero) digits is 7680, while the sum is 28.

The square root of 20823454 is about 4563.2722908019. The cubic root of 20823454 is about 275.1171027444.

The spelling of 20823454 in words is "twenty million, eight hundred twenty-three thousand, four hundred fifty-four".