20261966 has 4 divisors (see below), whose sum is σ = 30392952. Its totient is φ = 10130982.

The previous prime is 20261959. The next prime is 20261971. The reversal of 20261966 is 66916202.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5065490 + ... + 5065493.

It is an arithmetic number, because the mean of its divisors is an integer number (7598238).

Almost surely, 2^20261966 is an apocalyptic number.

20261966 is a deficient number, since it is larger than the sum of its proper divisors (10130986).

20261966 is a wasteful number, since it uses less digits than its factorization.

20261966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10130985.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 20261966 is about 4501.3293592005. The cubic root of 20261966 is about 272.6217664151.

It can be divided in two parts, 2026196 and 6, that added together give a palindrome (2026202).

The spelling of 20261966 in words is "twenty million, two hundred sixty-one thousand, nine hundred sixty-six".