20761869 has 16 divisors (see below), whose sum is σ = 28224000. Its totient is φ = 13573296.

The previous prime is 20761861. The next prime is 20761877. The reversal of 20761869 is 96816702.

It is an interprime number because it is at equal distance from previous prime (20761861) and next prime (20761877).

It is not a de Polignac number, because 20761869 - 2³ = 20761861 is a prime.

It is a super-2 number, since 2×20761869² = 862110408746322, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20761861) 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, 49342 + ... + 49760.

It is an arithmetic number, because the mean of its divisors is an integer number (1764000).

Almost surely, 2^20761869 is an apocalyptic number.

It is an amenable number.

20761869 is a deficient number, since it is larger than the sum of its proper divisors (7462131).

20761869 is a wasteful number, since it uses less digits than its factorization.

20761869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 704.

The product of its (nonzero) digits is 36288, while the sum is 39.

The square root of 20761869 is about 4556.5193953280. The cubic root of 20761869 is about 274.8456169279.

The spelling of 20761869 in words is "twenty million, seven hundred sixty-one thousand, eight hundred sixty-nine".