21290120

素因数分解:

$2^3\times 5^1\times {\mathrm{17}}^1\times {\mathrm{131}}^1\times {\mathrm{239}}^1$

素因数の和:398

約数の個数: 64

約数和(自身を含む): 51321600

約数和(自身を除く): 30031480

約数列:

[1, 2, 4, 5, 8, 10, 17, 20, 34, 40, 68, 85, 131, 136, 170, 239, 262, 340, 478, 524, 655, 680, 956, 1048, 1195, 1310, 1912, 2227, 2390, 2620, 4063, 4454, 4780, 5240, 8126, 8908, 9560, 11135, 16252, 17816, 20315, 22270, 31309, 32504, 40630, 44540, 62618, 81260, 89080, 125236, 156545, 162520, 250472, 313090, 532253, 626180, 1064506, 1252360, 2129012, 2661265, 4258024, 5322530, 10645060, 21290120]

約数ペア:

[(1, 21290120), (2, 10645060), (4, 5322530), (5, 4258024), (8, 2661265), (10, 2129012), (17, 1252360), (20, 1064506), (34, 626180), (40, 532253), (68, 313090), (85, 250472), (131, 162520), (136, 156545), (170, 125236), (239, 89080), (262, 81260), (340, 62618), (478, 44540), (524, 40630), (655, 32504), (680, 31309), (956, 22270), (1048, 20315), (1195, 17816), (1310, 16252), (1912, 11135), (2227, 9560), (2390, 8908), (2620, 8126), (4063, 5240), (4454, 4780)]