20023961 has 8 divisors (see below), whose sum is σ = 21038400. Its totient is φ = 19021552.

The previous prime is 20023933. The next prime is 20023981. The reversal of 20023961 is 16932002.

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

It is not a de Polignac number, because 20023961 - 2¹⁸ = 19761817 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20023901) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 506 + ... + 6348.

It is an arithmetic number, because the mean of its divisors is an integer number (2629800).

Almost surely, 2^20023961 is an apocalyptic number.

It is an amenable number.

20023961 is a deficient number, since it is larger than the sum of its proper divisors (1014439).

20023961 is a wasteful number, since it uses less digits than its factorization.

20023961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6015.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 20023961 is about 4474.8140743499. The cubic root of 20023961 is about 271.5501186662.

Adding to 20023961 its reverse (16932002), we get a palindrome (36955963).

The spelling of 20023961 in words is "twenty million, twenty-three thousand, nine hundred sixty-one".