21745720

素因数分解:

$2^3\times 5^1\times {\mathrm{17}}^1\times {\mathrm{113}}^1\times {\mathrm{283}}^1$

素因数の和:424

約数の個数: 64

約数和(自身を含む): 52449120

約数和(自身を除く): 30703400

約数列:

[1, 2, 4, 5, 8, 10, 17, 20, 34, 40, 68, 85, 113, 136, 170, 226, 283, 340, 452, 565, 566, 680, 904, 1130, 1132, 1415, 1921, 2260, 2264, 2830, 3842, 4520, 4811, 5660, 7684, 9605, 9622, 11320, 15368, 19210, 19244, 24055, 31979, 38420, 38488, 48110, 63958, 76840, 96220, 127916, 159895, 192440, 255832, 319790, 543643, 639580, 1087286, 1279160, 2174572, 2718215, 4349144, 5436430, 10872860, 21745720]

約数ペア:

[(1, 21745720), (2, 10872860), (4, 5436430), (5, 4349144), (8, 2718215), (10, 2174572), (17, 1279160), (20, 1087286), (34, 639580), (40, 543643), (68, 319790), (85, 255832), (113, 192440), (136, 159895), (170, 127916), (226, 96220), (283, 76840), (340, 63958), (452, 48110), (565, 38488), (566, 38420), (680, 31979), (904, 24055), (1130, 19244), (1132, 19210), (1415, 15368), (1921, 11320), (2260, 9622), (2264, 9605), (2830, 7684), (3842, 5660), (4520, 4811)]