20923118 has 4 divisors (see below), whose sum is σ = 31384680. Its totient is φ = 10461558.

The previous prime is 20923117. The next prime is 20923121. The reversal of 20923118 is 81132902.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81132902 = 2 ⋅40566451.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20923117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5230778 + ... + 5230781.

It is an arithmetic number, because the mean of its divisors is an integer number (7846170).

Almost surely, 2^20923118 is an apocalyptic number.

20923118 is a deficient number, since it is larger than the sum of its proper divisors (10461562).

20923118 is a wasteful number, since it uses less digits than its factorization.

20923118 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10461561.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 20923118 is about 4574.1794892636. The cubic root of 20923118 is about 275.5553208341. Note that the first 3 decimals are identical.

The spelling of 20923118 in words is "twenty million, nine hundred twenty-three thousand, one hundred eighteen".