1998880

素因数分解:

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

素因数の和:90

約数の個数: 72

約数和(自身を含む): 5254956

約数和(自身を除く): 3256076

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 31, 32, 40, 52, 62, 65, 80, 104, 124, 130, 155, 160, 208, 248, 260, 310, 403, 416, 496, 520, 620, 806, 961, 992, 1040, 1240, 1612, 1922, 2015, 2080, 2480, 3224, 3844, 4030, 4805, 4960, 6448, 7688, 8060, 9610, 12493, 12896, 15376, 16120, 19220, 24986, 30752, 32240, 38440, 49972, 62465, 64480, 76880, 99944, 124930, 153760, 199888, 249860, 399776, 499720, 999440, 1998880]

約数ペア:

[(1, 1998880), (2, 999440), (4, 499720), (5, 399776), (8, 249860), (10, 199888), (13, 153760), (16, 124930), (20, 99944), (26, 76880), (31, 64480), (32, 62465), (40, 49972), (52, 38440), (62, 32240), (65, 30752), (80, 24986), (104, 19220), (124, 16120), (130, 15376), (155, 12896), (160, 12493), (208, 9610), (248, 8060), (260, 7688), (310, 6448), (403, 4960), (416, 4805), (496, 4030), (520, 3844), (620, 3224), (806, 2480), (961, 2080), (992, 2015), (1040, 1922), (1240, 1612)]