Search a number
-
+
21700290 = 2353132311
BaseRepresentation
bin101001011000…
…1111011000010
31111211111012110
41102301323002
521023402130
62053040150
7352310103
oct122617302
944744173
1021700290
1111281827
127326056
13465a311
142c4c3aa
151d89ab0
hex14b1ec2

21700290 has 32 divisors (see below), whose sum is σ = 52269696. Its totient is φ = 5765760.

The previous prime is 21700253. The next prime is 21700291. The reversal of 21700290 is 9200712.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21700291) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8235 + ... + 10545.

It is an arithmetic number, because the mean of its divisors is an integer number (1633428).

Almost surely, 221700290 is an apocalyptic number.

21700290 is an abundant number, since it is smaller than the sum of its proper divisors (30569406).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21700290 is a wasteful number, since it uses less digits than its factorization.

21700290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2634.

The product of its (nonzero) digits is 252, while the sum is 21.

The square root of 21700290 is about 4658.3570064992. The cubic root of 21700290 is about 278.9256877405.

The spelling of 21700290 in words is "twenty-one million, seven hundred thousand, two hundred ninety".

Divisors: 1 2 3 5 6 10 15 30 313 626 939 1565 1878 2311 3130 4622 4695 6933 9390 11555 13866 23110 34665 69330 723343 1446686 2170029 3616715 4340058 7233430 10850145 21700290