20726123 has 4 divisors (see below), whose sum is σ = 22610328. Its totient is φ = 18841920.

The previous prime is 20726119. The next prime is 20726137. The reversal of 20726123 is 32162702.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20726123 - 2² = 20726119 is a prime.

It is a super-2 number, since 2×20726123² = 859144349222258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20726113) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 942086 + ... + 942107.

It is an arithmetic number, because the mean of its divisors is an integer number (5652582).

Almost surely, 2^20726123 is an apocalyptic number.

20726123 is a deficient number, since it is larger than the sum of its proper divisors (1884205).

20726123 is a wasteful number, since it uses less digits than its factorization.

20726123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1884204.

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 20726123 is about 4552.5951939526. The cubic root of 20726123 is about 274.6877911364.

Adding to 20726123 its reverse (32162702), we get a palindrome (52888825).

The spelling of 20726123 in words is "twenty million, seven hundred twenty-six thousand, one hundred twenty-three".