20261995 has 16 divisors (see below), whose sum is σ = 26826912. Its totient is φ = 14595840.

The previous prime is 20261993. The next prime is 20262017. The reversal of 20261995 is 59916202.

It is not a de Polignac number, because 20261995 - 2¹ = 20261993 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20261995.

It is not an unprimeable number, because it can be changed into a prime (20261993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1137 + ... + 6466.

It is an arithmetic number, because the mean of its divisors is an integer number (1676682).

Almost surely, 2^20261995 is an apocalyptic number.

20261995 is a deficient number, since it is larger than the sum of its proper divisors (6564917).

20261995 is a wasteful number, since it uses less digits than its factorization.

20261995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7662.

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 20261995 is about 4501.3325804699. The cubic root of 20261995 is about 272.6218964786.

The spelling of 20261995 in words is "twenty million, two hundred sixty-one thousand, nine hundred ninety-five".