20266830 has 48 divisors (see below), whose sum is σ = 53496144. Its totient is φ = 5322240.

The previous prime is 20266793. The next prime is 20266837. The reversal of 20266830 is 3866202.

It is a junction number, because it is equal to n+sod(n) for n = 20266794 and 20266803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20266837) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4350 + ... + 7710.

It is an arithmetic number, because the mean of its divisors is an integer number (1114503).

Almost surely, 2^20266830 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20266830, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26748072).

20266830 is an abundant number, since it is smaller than the sum of its proper divisors (33229314).

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

20266830 is a wasteful number, since it uses less digits than its factorization.

20266830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3441 (or 3438 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 20266830 is about 4501.8696116169. The cubic root of 20266830 is about 272.6435794708.

The spelling of 20266830 in words is "twenty million, two hundred sixty-six thousand, eight hundred thirty".