21819640

素因数分解:

$2^3\times 5^1\times {\mathrm{23}}^1\times {\mathrm{37}}^1\times {\mathrm{641}}^1$

素因数の和:712

約数の個数: 64

約数和(自身を含む): 52695360

約数和(自身を除く): 30875720

約数列:

[1, 2, 4, 5, 8, 10, 20, 23, 37, 40, 46, 74, 92, 115, 148, 184, 185, 230, 296, 370, 460, 641, 740, 851, 920, 1282, 1480, 1702, 2564, 3205, 3404, 4255, 5128, 6410, 6808, 8510, 12820, 14743, 17020, 23717, 25640, 29486, 34040, 47434, 58972, 73715, 94868, 117944, 118585, 147430, 189736, 237170, 294860, 474340, 545491, 589720, 948680, 1090982, 2181964, 2727455, 4363928, 5454910, 10909820, 21819640]

約数ペア:

[(1, 21819640), (2, 10909820), (4, 5454910), (5, 4363928), (8, 2727455), (10, 2181964), (20, 1090982), (23, 948680), (37, 589720), (40, 545491), (46, 474340), (74, 294860), (92, 237170), (115, 189736), (148, 147430), (184, 118585), (185, 117944), (230, 94868), (296, 73715), (370, 58972), (460, 47434), (641, 34040), (740, 29486), (851, 25640), (920, 23717), (1282, 17020), (1480, 14743), (1702, 12820), (2564, 8510), (3205, 6808), (3404, 6410), (4255, 5128)]