20095781 has 16 divisors (see below), whose sum is σ = 21600768. Its totient is φ = 18662400.

The previous prime is 20095763. The next prime is 20095799. The reversal of 20095781 is 18759002.

20095781 = 104² + 105² + ... + 394².

It is an interprime number because it is at equal distance from previous prime (20095763) and next prime (20095799).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20095781 is a prime.

It is a super-2 number, since 2×20095781² = 807680827999922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20095381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 123206 + ... + 123368.

It is an arithmetic number, because the mean of its divisors is an integer number (1350048).

Almost surely, 2^20095781 is an apocalyptic number.

It is an amenable number.

20095781 is a deficient number, since it is larger than the sum of its proper divisors (1504987).

20095781 is a wasteful number, since it uses less digits than its factorization.

20095781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332.

The product of its (nonzero) digits is 5040, while the sum is 32.

The square root of 20095781 is about 4482.8318059013. The cubic root of 20095781 is about 271.8743878262.

The spelling of 20095781 in words is "twenty million, ninety-five thousand, seven hundred eighty-one".