20261766 has 16 divisors (see below), whose sum is σ = 46312704. Its totient is φ = 5789064.

The previous prime is 20261753. The next prime is 20261777. The reversal of 20261766 is 66716202.

It is a super-2 number, since 2×20261766² = 821078322877512, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 241170 + ... + 241253.

It is an arithmetic number, because the mean of its divisors is an integer number (2894544).

Almost surely, 2^20261766 is an apocalyptic number.

20261766 is an abundant number, since it is smaller than the sum of its proper divisors (26050938).

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

20261766 is a wasteful number, since it uses less digits than its factorization.

20261766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 482435.

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 20261766 is about 4501.3071434862. The cubic root of 20261766 is about 272.6208694219.

Adding to 20261766 its reverse (66716202), we get a palindrome (86977968).

The spelling of 20261766 in words is "twenty million, two hundred sixty-one thousand, seven hundred sixty-six".