Base | Representation |
---|---|
bin | 100111010111… |
… | …1101111100111 |
3 | 1102211202120211 |
4 | 1032233233213 |
5 | 20241032131 |
6 | 2014240251 |
7 | 340314031 |
oct | 116575747 |
9 | 42752524 |
10 | 20642791 |
11 | 1071a264 |
12 | 6ab6087 |
13 | 4379b90 |
14 | 2a54c51 |
15 | 1c2b5b1 |
hex | 13afbe7 |
20642791 has 8 divisors (see below), whose sum is σ = 22317120. Its totient is φ = 18980832.
The previous prime is 20642789. The next prime is 20642821. The reversal of 20642791 is 19724602.
It is a sphenic number, since it is the product of 3 distinct primes.
It is not a de Polignac number, because 20642791 - 21 = 20642789 is a prime.
It is a super-2 number, since 2×206427912 = 852249640539362, which contains 22 as substring.
It is a Duffinian number.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (20642731) by changing a digit.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 546 + ... + 6448.
It is an arithmetic number, because the mean of its divisors is an integer number (2789640).
Almost surely, 220642791 is an apocalyptic number.
20642791 is a deficient number, since it is larger than the sum of its proper divisors (1674329).
20642791 is a wasteful number, since it uses less digits than its factorization.
20642791 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 6185.
The product of its (nonzero) digits is 6048, while the sum is 31.
The square root of 20642791 is about 4543.4338335669. The cubic root of 20642791 is about 274.3191576414.
The spelling of 20642791 in words is "twenty million, six hundred forty-two thousand, seven hundred ninety-one".
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