81371960

素因数分解:

$2^3\times 5^1\times {\mathrm{53}}^1\times {\mathrm{131}}^1\times {\mathrm{293}}^1$

素因数の和:488

約数の個数: 64

約数和(自身を含む): 188606880

約数和(自身を除く): 107234920

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 53, 106, 131, 212, 262, 265, 293, 424, 524, 530, 586, 655, 1048, 1060, 1172, 1310, 1465, 2120, 2344, 2620, 2930, 5240, 5860, 6943, 11720, 13886, 15529, 27772, 31058, 34715, 38383, 55544, 62116, 69430, 76766, 77645, 124232, 138860, 153532, 155290, 191915, 277720, 307064, 310580, 383830, 621160, 767660, 1535320, 2034299, 4068598, 8137196, 10171495, 16274392, 20342990, 40685980, 81371960]

約数ペア:

[(1, 81371960), (2, 40685980), (4, 20342990), (5, 16274392), (8, 10171495), (10, 8137196), (20, 4068598), (40, 2034299), (53, 1535320), (106, 767660), (131, 621160), (212, 383830), (262, 310580), (265, 307064), (293, 277720), (424, 191915), (524, 155290), (530, 153532), (586, 138860), (655, 124232), (1048, 77645), (1060, 76766), (1172, 69430), (1310, 62116), (1465, 55544), (2120, 38383), (2344, 34715), (2620, 31058), (2930, 27772), (5240, 15529), (5860, 13886), (6943, 11720)]