20923488 has 96 divisors (see below), whose sum is σ = 62183520. Its totient is φ = 6842880.

The previous prime is 20923459. The next prime is 20923493. The reversal of 20923488 is 88432902.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×20923488² = 875584700172288, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52506 + ... + 52902.

It is an arithmetic number, because the mean of its divisors is an integer number (647745).

Almost surely, 2^20923488 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 20923488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31091760).

20923488 is an abundant number, since it is smaller than the sum of its proper divisors (41260032).

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

20923488 is a wasteful number, since it uses less digits than its factorization.

20923488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 477 (or 463 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 20923488 is about 4574.2199334969. The cubic root of 20923488 is about 275.5569451119.

The spelling of 20923488 in words is "twenty million, nine hundred twenty-three thousand, four hundred eighty-eight".