20151023 has 8 divisors (see below), whose sum is σ = 21006336. Its totient is φ = 19308600.

The previous prime is 20151011. The next prime is 20151031. The reversal of 20151023 is 32015102.

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 not a de Polignac number, because 20151023 - 2¹² = 20146927 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 20150989 and 20151007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20156023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38 + ... + 6348.

It is an arithmetic number, because the mean of its divisors is an integer number (2625792).

Almost surely, 2^20151023 is an apocalyptic number.

20151023 is a deficient number, since it is larger than the sum of its proper divisors (855313).

20151023 is a wasteful number, since it uses less digits than its factorization.

20151023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6445.

The product of its (nonzero) digits is 60, while the sum is 14.

The square root of 20151023 is about 4488.9890844153. The cubic root of 20151023 is about 272.1232815936.

Adding to 20151023 its reverse (32015102), we get a palindrome (52166125).

The spelling of 20151023 in words is "twenty million, one hundred fifty-one thousand, twenty-three".