20723138 has 8 divisors (see below), whose sum is σ = 32436288. Its totient is φ = 9911044.

The previous prime is 20723137. The next prime is 20723173. The reversal of 20723138 is 83132702.

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

It is not an unprimeable number, because it can be changed into a prime (20723137) 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, 225206 + ... + 225297.

It is an arithmetic number, because the mean of its divisors is an integer number (4054536).

Almost surely, 2^20723138 is an apocalyptic number.

20723138 is a deficient number, since it is larger than the sum of its proper divisors (11713150).

20723138 is a wasteful number, since it uses less digits than its factorization.

20723138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 450528.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 20723138 is about 4552.2673471579. The cubic root of 20723138 is about 274.6746035531.

The spelling of 20723138 in words is "twenty million, seven hundred twenty-three thousand, one hundred thirty-eight".