Search a number
-
+
21830806 = 253205951
BaseRepresentation
bin101001101000…
…1110010010110
31112002010020101
41103101302112
521042041211
62055524314
7353362444
oct123216226
945063211
1021830806
1111360898
12738969a
1346a484a
142c83b94
151db35c1
hex14d1c96

21830806 has 8 divisors (see below), whose sum is σ = 33364224. Its totient is φ = 10709400.

The previous prime is 21830803. The next prime is 21830843. The reversal of 21830806 is 60803812.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21830801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 102870 + ... + 103081.

It is an arithmetic number, because the mean of its divisors is an integer number (4170528).

Almost surely, 221830806 is an apocalyptic number.

21830806 is a deficient number, since it is larger than the sum of its proper divisors (11533418).

21830806 is a wasteful number, since it uses less digits than its factorization.

21830806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206006.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 21830806 is about 4672.3448074816. The cubic root of 21830806 is about 279.4837682039.

The spelling of 21830806 in words is "twenty-one million, eight hundred thirty thousand, eight hundred six".

Divisors: 1 2 53 106 205951 411902 10915403 21830806