20640172

素因数分解:

$2^2\times 7^2\times {\mathrm{31}}^1\times {\mathrm{43}}^1\times {\mathrm{79}}^1$

素因数の和:171

約数の個数: 72

約数和(自身を含む): 44943360

約数和(自身を除く): 24303188

約数列:

[1, 2, 4, 7, 14, 28, 31, 43, 49, 62, 79, 86, 98, 124, 158, 172, 196, 217, 301, 316, 434, 553, 602, 868, 1106, 1204, 1333, 1519, 2107, 2212, 2449, 2666, 3038, 3397, 3871, 4214, 4898, 5332, 6076, 6794, 7742, 8428, 9331, 9796, 13588, 15484, 17143, 18662, 23779, 34286, 37324, 47558, 65317, 68572, 95116, 105307, 120001, 130634, 166453, 210614, 240002, 261268, 332906, 421228, 480004, 665812, 737149, 1474298, 2948596, 5160043, 10320086, 20640172]

約数ペア:

[(1, 20640172), (2, 10320086), (4, 5160043), (7, 2948596), (14, 1474298), (28, 737149), (31, 665812), (43, 480004), (49, 421228), (62, 332906), (79, 261268), (86, 240002), (98, 210614), (124, 166453), (158, 130634), (172, 120001), (196, 105307), (217, 95116), (301, 68572), (316, 65317), (434, 47558), (553, 37324), (602, 34286), (868, 23779), (1106, 18662), (1204, 17143), (1333, 15484), (1519, 13588), (2107, 9796), (2212, 9331), (2449, 8428), (2666, 7742), (3038, 6794), (3397, 6076), (3871, 5332), (4214, 4898)]