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20706531 = 334719891
BaseRepresentation
bin100111011111…
…1010011100011
31102222000000120
41032333103203
520300102111
62015451323
7341000616
oct116772343
942860016
1020706531
111076313a
126b26b43
13439cbb1
142a7017d
151c40406
hex13bf4e3

20706531 has 8 divisors (see below), whose sum is σ = 27689664. Its totient is φ = 13763880.

The previous prime is 20706503. The next prime is 20706557. The reversal of 20706531 is 13560702.

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

It is not a de Polignac number, because 20706531 - 29 = 20706019 is a prime.

It is a super-2 number, since 2×207065312 = 857520852107922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20706571) 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, 8905 + ... + 10986.

It is an arithmetic number, because the mean of its divisors is an integer number (3461208).

Almost surely, 220706531 is an apocalyptic number.

20706531 is a deficient number, since it is larger than the sum of its proper divisors (6983133).

20706531 is a wasteful number, since it uses less digits than its factorization.

20706531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20241.

The product of its (nonzero) digits is 1260, while the sum is 24.

The square root of 20706531 is about 4550.4429454725. The cubic root of 20706531 is about 274.6012115121.

The spelling of 20706531 in words is "twenty million, seven hundred six thousand, five hundred thirty-one".

Divisors: 1 3 347 1041 19891 59673 6902177 20706531