20106723 has 16 divisors (see below), whose sum is σ = 32996096. Its totient is φ = 10605600.

The previous prime is 20106721. The next prime is 20106727. The reversal of 20106723 is 32760102.

It is a happy number.

It is not a de Polignac number, because 20106723 - 2¹ = 20106721 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 20106723.

It is not an unprimeable number, because it can be changed into a prime (20106721) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36553 + ... + 37098.

It is an arithmetic number, because the mean of its divisors is an integer number (2062256).

Almost surely, 2^20106723 is an apocalyptic number.

20106723 is a deficient number, since it is larger than the sum of its proper divisors (12889373).

20106723 is a wasteful number, since it uses less digits than its factorization.

20106723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73674.

The product of its (nonzero) digits is 504, while the sum is 21.

The square root of 20106723 is about 4484.0520737387. The cubic root of 20106723 is about 271.9237233855.

Adding to 20106723 its reverse (32760102), we get a palindrome (52866825).

The spelling of 20106723 in words is "twenty million, one hundred six thousand, seven hundred twenty-three".