21612890

素因数分解:

$2^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{31}}^2\times {\mathrm{173}}^1$

素因数の和:255

約数の個数: 48

約数和(自身を含む): 43541064

約数和(自身を除く): 21928174

約数列:

[1, 2, 5, 10, 13, 26, 31, 62, 65, 130, 155, 173, 310, 346, 403, 806, 865, 961, 1730, 1922, 2015, 2249, 4030, 4498, 4805, 5363, 9610, 10726, 11245, 12493, 22490, 24986, 26815, 53630, 62465, 69719, 124930, 139438, 166253, 332506, 348595, 697190, 831265, 1662530, 2161289, 4322578, 10806445, 21612890]

約数ペア:

[(1, 21612890), (2, 10806445), (5, 4322578), (10, 2161289), (13, 1662530), (26, 831265), (31, 697190), (62, 348595), (65, 332506), (130, 166253), (155, 139438), (173, 124930), (310, 69719), (346, 62465), (403, 53630), (806, 26815), (865, 24986), (961, 22490), (1730, 12493), (1922, 11245), (2015, 10726), (2249, 9610), (4030, 5363), (4498, 4805)]