20723670 has 96 divisors (see below), whose sum is σ = 59608224. Its totient is φ = 4994880.

The previous prime is 20723669. The next prime is 20723671. The reversal of 20723670 is 7632702.

It is an interprime number because it is at equal distance from previous prime (20723669) and next prime (20723671).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20723671) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 119704 + ... + 119876.

It is an arithmetic number, because the mean of its divisors is an integer number (620919).

Almost surely, 2^20723670 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20723670, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29804112).

20723670 is an abundant number, since it is smaller than the sum of its proper divisors (38884554).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20723670 is a wasteful number, since it uses less digits than its factorization.

20723670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219 (or 194 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 27.

The square root of 20723670 is about 4552.3257792034. The cubic root of 20723670 is about 274.6769539957.

The spelling of 20723670 in words is "twenty million, seven hundred twenty-three thousand, six hundred seventy".