20424851 has 8 divisors (see below), whose sum is σ = 21889824. Its totient is φ = 19008000.

The previous prime is 20424841. The next prime is 20424869. The reversal of 20424851 is 15842402.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20424851 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20424851.

It is not an unprimeable number, because it can be changed into a prime (20424841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11150 + ... + 12851.

It is an arithmetic number, because the mean of its divisors is an integer number (2736228).

Almost surely, 2^20424851 is an apocalyptic number.

20424851 is a deficient number, since it is larger than the sum of its proper divisors (1464973).

20424851 is a wasteful number, since it uses less digits than its factorization.

20424851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24061.

The product of its (nonzero) digits is 2560, while the sum is 26.

The square root of 20424851 is about 4519.3861308811. The cubic root of 20424851 is about 273.3503487656.

The spelling of 20424851 in words is "twenty million, four hundred twenty-four thousand, eight hundred fifty-one".