21004520

素因数分解:

$2^3\times 5^1\times {\mathrm{17}}^2\times {\mathrm{23}}^1\times {\mathrm{79}}^1$

素因数の和:147

約数の個数: 96

約数和(自身を含む): 53049600

約数和(自身を除く): 32045080

約数列:

[1, 2, 4, 5, 8, 10, 17, 20, 23, 34, 40, 46, 68, 79, 85, 92, 115, 136, 158, 170, 184, 230, 289, 316, 340, 391, 395, 460, 578, 632, 680, 782, 790, 920, 1156, 1343, 1445, 1564, 1580, 1817, 1955, 2312, 2686, 2890, 3128, 3160, 3634, 3910, 5372, 5780, 6647, 6715, 7268, 7820, 9085, 10744, 11560, 13294, 13430, 14536, 15640, 18170, 22831, 26588, 26860, 30889, 33235, 36340, 45662, 53176, 53720, 61778, 66470, 72680, 91324, 114155, 123556, 132940, 154445, 182648, 228310, 247112, 265880, 308890, 456620, 525113, 617780, 913240, 1050226, 1235560, 2100452, 2625565, 4200904, 5251130, 10502260, 21004520]

約数ペア:

[(1, 21004520), (2, 10502260), (4, 5251130), (5, 4200904), (8, 2625565), (10, 2100452), (17, 1235560), (20, 1050226), (23, 913240), (34, 617780), (40, 525113), (46, 456620), (68, 308890), (79, 265880), (85, 247112), (92, 228310), (115, 182648), (136, 154445), (158, 132940), (170, 123556), (184, 114155), (230, 91324), (289, 72680), (316, 66470), (340, 61778), (391, 53720), (395, 53176), (460, 45662), (578, 36340), (632, 33235), (680, 30889), (782, 26860), (790, 26588), (920, 22831), (1156, 18170), (1343, 15640), (1445, 14536), (1564, 13430), (1580, 13294), (1817, 11560), (1955, 10744), (2312, 9085), (2686, 7820), (2890, 7268), (3128, 6715), (3160, 6647), (3634, 5780), (3910, 5372)]