20923116 has 12 divisors (see below), whose sum is σ = 48820632. Its totient is φ = 6974368.

The previous prime is 20923103. The next prime is 20923117. The reversal of 20923116 is 61132902.

It is a tau number, because it is divible by the number of its divisors (12).

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 in 3 ways as a sum of consecutive naturals, for example, 871785 + ... + 871808.

It is an arithmetic number, because the mean of its divisors is an integer number (4068386).

Almost surely, 2^20923116 is an apocalyptic number.

It is an amenable number.

20923116 is an abundant number, since it is smaller than the sum of its proper divisors (27897516).

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

20923116 is a wasteful number, since it uses less digits than its factorization.

20923116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1743600 (or 1743598 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 20923116 is about 4574.1792706452. The cubic root of 20923116 is about 275.5553120542. Note that the first 3 decimals are identical.

The spelling of 20923116 in words is "twenty million, nine hundred twenty-three thousand, one hundred sixteen".