20266238 has 4 divisors (see below), whose sum is σ = 30399360. Its totient is φ = 10133118.

The previous prime is 20266237. The next prime is 20266241. The reversal of 20266238 is 83266202.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 20266238.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20266231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5066558 + ... + 5066561.

It is an arithmetic number, because the mean of its divisors is an integer number (7599840).

Almost surely, 2^20266238 is an apocalyptic number.

20266238 is a deficient number, since it is larger than the sum of its proper divisors (10133122).

20266238 is a wasteful number, since it uses less digits than its factorization.

20266238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10133121.

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 20266238 is about 4501.8038606763. The cubic root of 20266238 is about 272.6409247788.

The spelling of 20266238 in words is "twenty million, two hundred sixty-six thousand, two hundred thirty-eight".