20423013 has 8 divisors (see below), whose sum is σ = 29325408. Its totient is φ = 12567984.

The previous prime is 20422993. The next prime is 20423023. The reversal of 20423013 is 31032402.

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

It is not a de Polignac number, because 20423013 - 2⁶ = 20422949 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20422983 and 20423001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20423023) 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, 261795 + ... + 261872.

It is an arithmetic number, because the mean of its divisors is an integer number (3665676).

Almost surely, 2^20423013 is an apocalyptic number.

It is an amenable number.

20423013 is a deficient number, since it is larger than the sum of its proper divisors (8902395).

20423013 is a wasteful number, since it uses less digits than its factorization.

20423013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 523683.

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 20423013 is about 4519.1827801053. The cubic root of 20423013 is about 273.3421490646.

Adding to 20423013 its reverse (31032402), we get a palindrome (51455415).

The spelling of 20423013 in words is "twenty million, four hundred twenty-three thousand, thirteen".