21420680

素因数分解:

$2^3\times 5^1\times {\mathrm{17}}^3\times {\mathrm{109}}^1$

素因数の和:171

約数の個数: 64

約数和(自身を含む): 51678000

約数和(自身を除く): 30257320

約数列:

[1, 2, 4, 5, 8, 10, 17, 20, 34, 40, 68, 85, 109, 136, 170, 218, 289, 340, 436, 545, 578, 680, 872, 1090, 1156, 1445, 1853, 2180, 2312, 2890, 3706, 4360, 4913, 5780, 7412, 9265, 9826, 11560, 14824, 18530, 19652, 24565, 31501, 37060, 39304, 49130, 63002, 74120, 98260, 126004, 157505, 196520, 252008, 315010, 535517, 630020, 1071034, 1260040, 2142068, 2677585, 4284136, 5355170, 10710340, 21420680]

約数ペア:

[(1, 21420680), (2, 10710340), (4, 5355170), (5, 4284136), (8, 2677585), (10, 2142068), (17, 1260040), (20, 1071034), (34, 630020), (40, 535517), (68, 315010), (85, 252008), (109, 196520), (136, 157505), (170, 126004), (218, 98260), (289, 74120), (340, 63002), (436, 49130), (545, 39304), (578, 37060), (680, 31501), (872, 24565), (1090, 19652), (1156, 18530), (1445, 14824), (1853, 11560), (2180, 9826), (2312, 9265), (2890, 7412), (3706, 5780), (4360, 4913)]