20266461 has 6 divisors (see below), whose sum is σ = 29273790. Its totient is φ = 13510968.

The previous prime is 20266451. The next prime is 20266469. The reversal of 20266461 is 16466202.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 17690436 + 2576025 = 4206^2 + 1605^2 .

It is not a de Polignac number, because 20266461 - 2⁵ = 20266429 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20266469) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1125906 + ... + 1125923.

It is an arithmetic number, because the mean of its divisors is an integer number (4878965).

Almost surely, 2^20266461 is an apocalyptic number.

It is an amenable number.

20266461 is a deficient number, since it is larger than the sum of its proper divisors (9007329).

20266461 is a wasteful number, since it uses less digits than its factorization.

20266461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2251835 (or 2251832 counting only the distinct ones).

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

The square root of 20266461 is about 4501.8286284576. The cubic root of 20266461 is about 272.6419247786.

The spelling of 20266461 in words is "twenty million, two hundred sixty-six thousand, four hundred sixty-one".