21316640

素因数分解:

$2^5\times 5^1\times {\mathrm{17}}^2\times {\mathrm{461}}^1$

素因数の和:510

約数の個数: 72

約数和(自身を含む): 53613252

約数和(自身を除く): 32296612

約数列:

[1, 2, 4, 5, 8, 10, 16, 17, 20, 32, 34, 40, 68, 80, 85, 136, 160, 170, 272, 289, 340, 461, 544, 578, 680, 922, 1156, 1360, 1445, 1844, 2305, 2312, 2720, 2890, 3688, 4610, 4624, 5780, 7376, 7837, 9220, 9248, 11560, 14752, 15674, 18440, 23120, 31348, 36880, 39185, 46240, 62696, 73760, 78370, 125392, 133229, 156740, 250784, 266458, 313480, 532916, 626960, 666145, 1065832, 1253920, 1332290, 2131664, 2664580, 4263328, 5329160, 10658320, 21316640]

約数ペア:

[(1, 21316640), (2, 10658320), (4, 5329160), (5, 4263328), (8, 2664580), (10, 2131664), (16, 1332290), (17, 1253920), (20, 1065832), (32, 666145), (34, 626960), (40, 532916), (68, 313480), (80, 266458), (85, 250784), (136, 156740), (160, 133229), (170, 125392), (272, 78370), (289, 73760), (340, 62696), (461, 46240), (544, 39185), (578, 36880), (680, 31348), (922, 23120), (1156, 18440), (1360, 15674), (1445, 14752), (1844, 11560), (2305, 9248), (2312, 9220), (2720, 7837), (2890, 7376), (3688, 5780), (4610, 4624)]