20713123 has 8 divisors (see below), whose sum is σ = 22079520. Its totient is φ = 19363200.

The previous prime is 20713109. The next prime is 20713127. The reversal of 20713123 is 32131702.

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-20713123 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 20713123.

It is not an unprimeable number, because it can be changed into a prime (20713127) 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, 1468 + ... + 6601.

It is an arithmetic number, because the mean of its divisors is an integer number (2759940).

Almost surely, 2^20713123 is an apocalyptic number.

20713123 is a deficient number, since it is larger than the sum of its proper divisors (1366397).

20713123 is a wasteful number, since it uses less digits than its factorization.

20713123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8237.

The product of its (nonzero) digits is 252, while the sum is 19.

The square root of 20713123 is about 4551.1672129246. The cubic root of 20713123 is about 274.6303485209.

Adding to 20713123 its reverse (32131702), we get a palindrome (52844825).

The spelling of 20713123 in words is "twenty million, seven hundred thirteen thousand, one hundred twenty-three".