20923487 has 8 divisors (see below), whose sum is σ = 22851360. Its totient is φ = 19041120.

The previous prime is 20923459. The next prime is 20923493. The reversal of 20923487 is 78432902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20923487 - 2¹⁰ = 20922463 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20923417) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10412 + ... + 12257.

It is an arithmetic number, because the mean of its divisors is an integer number (2856420).

Almost surely, 2^20923487 is an apocalyptic number.

20923487 is a deficient number, since it is larger than the sum of its proper divisors (1927873).

20923487 is a wasteful number, since it uses less digits than its factorization.

20923487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22753.

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 20923487 is about 4574.2198241886. The cubic root of 20923487 is about 275.5569407220.

The spelling of 20923487 in words is "twenty million, nine hundred twenty-three thousand, four hundred eighty-seven".