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131366220 = 22353170627
BaseRepresentation
bin1111101010001…
…11110101001100
3100011012002120120
413311013311030
5232112204340
621011344540
73153410616
oct765076514
9304162516
10131366220
1168175427
1237bb2150
13212a65bb
1413637db6
15b7ed4d0
hex7d47d4c

131366220 has 48 divisors (see below), whose sum is σ = 379696128. Its totient is φ = 33900480.

The previous prime is 131366159. The next prime is 131366231. The reversal of 131366220 is 22663131.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33454 + ... + 37173.

It is an arithmetic number, because the mean of its divisors is an integer number (7910336).

Almost surely, 2131366220 is an apocalyptic number.

131366220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

131366220 is an abundant number, since it is smaller than the sum of its proper divisors (248329908).

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

131366220 is a wasteful number, since it uses less digits than its factorization.

131366220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70670 (or 70668 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 24.

The square root of 131366220 is about 11461.5103716744. The cubic root of 131366220 is about 508.3481348970.

The spelling of 131366220 in words is "one hundred thirty-one million, three hundred sixty-six thousand, two hundred twenty".

Divisors: 1 2 3 4 5 6 10 12 15 20 30 31 60 62 93 124 155 186 310 372 465 620 930 1860 70627 141254 211881 282508 353135 423762 706270 847524 1059405 1412540 2118810 2189437 4237620 4378874 6568311 8757748 10947185 13136622 21894370 26273244 32841555 43788740 65683110 131366220