20266220 has 48 divisors (see below), whose sum is σ = 47839680. Its totient is φ = 7155456.

The previous prime is 20266199. The next prime is 20266223. The reversal of 20266220 is 2266202.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 20266192 and 20266201.

It is not an unprimeable number, because it can be changed into a prime (20266223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4286 + ... + 7674.

It is an arithmetic number, because the mean of its divisors is an integer number (996660).

Almost surely, 2^20266220 is an apocalyptic number.

20266220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20266220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23919840).

20266220 is an abundant number, since it is smaller than the sum of its proper divisors (27573460).

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

20266220 is a wasteful number, since it uses less digits than its factorization.

20266220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3434 (or 3432 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 20266220 is about 4501.8018614772. The cubic root of 20266220 is about 272.6408440610.

The spelling of 20266220 in words is "twenty million, two hundred sixty-six thousand, two hundred twenty".