20723850 has 240 divisors, whose sum is σ = 71299008. Its totient is φ = 4354560.

The previous prime is 20723849. The next prime is 20723863. The reversal of 20723850 is 5832702.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 481929 + ... + 481971.

Almost surely, 2^20723850 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20723850, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35649504).

20723850 is an abundant number, since it is smaller than the sum of its proper divisors (50575158).

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

20723850 is a wasteful number, since it uses less digits than its factorization.

20723850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91 (or 77 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 20723850 is about 4552.3455492746. The cubic root of 20723850 is about 274.6777492491.

The spelling of 20723850 in words is "twenty million, seven hundred twenty-three thousand, eight hundred fifty".