20266240 has 72 divisors (see below), whose sum is σ = 49448448. Its totient is φ = 7956480.

The previous prime is 20266237. The next prime is 20266241. The reversal of 20266240 is 4266202.

It is a happy number.

It is a hoax number, since the sum of its digits (22) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20266241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 90769 + ... + 90991.

It is an arithmetic number, because the mean of its divisors is an integer number (686784).

Almost surely, 2^20266240 is an apocalyptic number.

20266240 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 20266240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24724224).

20266240 is an abundant number, since it is smaller than the sum of its proper divisors (29182208).

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

20266240 is an equidigital number, since it uses as much as digits as its factorization.

20266240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315 (or 301 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 20266240 is about 4501.8040828095. The cubic root of 20266240 is about 272.6409337475.

The spelling of 20266240 in words is "twenty million, two hundred sixty-six thousand, two hundred forty".