20317761 has 6 divisors (see below), whose sum is σ = 29347890. Its totient is φ = 13545168.

The previous prime is 20317757. The next prime is 20317799. The reversal of 20317761 is 16771302.

It can be written as a sum of positive squares in only one way, i.e., 13395600 + 6922161 = 3660^2 + 2631^2 .

It is not a de Polignac number, because 20317761 - 2² = 20317757 is a prime.

It is a super-2 number, since 2×20317761² = 825622824106242, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20317711) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1128756 + ... + 1128773.

It is an arithmetic number, because the mean of its divisors is an integer number (4891315).

Almost surely, 2^20317761 is an apocalyptic number.

It is an amenable number.

20317761 is a deficient number, since it is larger than the sum of its proper divisors (9030129).

20317761 is a wasteful number, since it uses less digits than its factorization.

20317761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2257535 (or 2257532 counting only the distinct ones).

The product of its (nonzero) digits is 1764, while the sum is 27.

The square root of 20317761 is about 4507.5227120892. The cubic root of 20317761 is about 272.8717749081.

The spelling of 20317761 in words is "twenty million, three hundred seventeen thousand, seven hundred sixty-one".