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20631206 = 210315603
BaseRepresentation
bin100111010110…
…0111010100110
31102211011200202
41032230322212
520240144311
62014110502
7340235201
oct116547246
942734622
1020631206
1110711592
126aab432
13437481b
142a50938
151c27e3b
hex13acea6

20631206 has 4 divisors (see below), whose sum is σ = 30946812. Its totient is φ = 10315602.

The previous prime is 20631203. The next prime is 20631229. The reversal of 20631206 is 60213602.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 60213602 = 230106801.

It is a super-2 number, since 2×206312062 = 851293322028872, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20631203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5157800 + ... + 5157803.

It is an arithmetic number, because the mean of its divisors is an integer number (7736703).

Almost surely, 220631206 is an apocalyptic number.

20631206 is a deficient number, since it is larger than the sum of its proper divisors (10315606).

20631206 is a wasteful number, since it uses less digits than its factorization.

20631206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10315605.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 20631206 is about 4542.1587378690. The cubic root of 20631206 is about 274.2678308911.

Adding to 20631206 its reverse (60213602), we get a palindrome (80844808).

The spelling of 20631206 in words is "twenty million, six hundred thirty-one thousand, two hundred six".

Divisors: 1 2 10315603 20631206