20262661 has 2 divisors, whose sum is σ = 20262662. Its totient is φ = 20262660.

The previous prime is 20262647. The next prime is 20262673. The reversal of 20262661 is 16626202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10929636 + 9333025 = 3306^2 + 3055^2 .

It is a cyclic number.

It is not a de Polignac number, because 20262661 - 2⁷ = 20262533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20262601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10131330 + 10131331.

It is an arithmetic number, because the mean of its divisors is an integer number (10131331).

Almost surely, 2^20262661 is an apocalyptic number.

It is an amenable number.

20262661 is a deficient number, since it is larger than the sum of its proper divisors (1).

20262661 is an equidigital number, since it uses as much as digits as its factorization.

20262661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 20262661 is about 4501.4065579550. The cubic root of 20262661 is about 272.6248834203.

Adding to 20262661 its reverse (16626202), we get a palindrome (36888863).

The spelling of 20262661 in words is "twenty million, two hundred sixty-two thousand, six hundred sixty-one".