20424891 has 8 divisors (see below), whose sum is σ = 27262480. Its totient is φ = 13601952.

The previous prime is 20424869. The next prime is 20424893. The reversal of 20424891 is 19842402.

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

It is not a de Polignac number, because 20424891 - 2⁶ = 20424827 is a prime.

It is a super-3 number, since 3×20424891³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20424893) 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, 165 + ... + 6393.

It is an arithmetic number, because the mean of its divisors is an integer number (3407810).

Almost surely, 2^20424891 is an apocalyptic number.

20424891 is a deficient number, since it is larger than the sum of its proper divisors (6837589).

20424891 is a wasteful number, since it uses less digits than its factorization.

20424891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7325.

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 20424891 is about 4519.3905562587. The cubic root of 20424891 is about 273.3505272084.

The spelling of 20424891 in words is "twenty million, four hundred twenty-four thousand, eight hundred ninety-one".