18001720

素因数分解:

$2^3\times 5^1\times {\mathrm{11}}^1\times {\mathrm{163}}^1\times {\mathrm{251}}^1$

素因数の和:436

約数の個数: 64

約数和(自身を含む): 44634240

約数和(自身を除く): 26632520

約数列:

[1, 2, 4, 5, 8, 10, 11, 20, 22, 40, 44, 55, 88, 110, 163, 220, 251, 326, 440, 502, 652, 815, 1004, 1255, 1304, 1630, 1793, 2008, 2510, 2761, 3260, 3586, 5020, 5522, 6520, 7172, 8965, 10040, 11044, 13805, 14344, 17930, 22088, 27610, 35860, 40913, 55220, 71720, 81826, 110440, 163652, 204565, 327304, 409130, 450043, 818260, 900086, 1636520, 1800172, 2250215, 3600344, 4500430, 9000860, 18001720]

約数ペア:

[(1, 18001720), (2, 9000860), (4, 4500430), (5, 3600344), (8, 2250215), (10, 1800172), (11, 1636520), (20, 900086), (22, 818260), (40, 450043), (44, 409130), (55, 327304), (88, 204565), (110, 163652), (163, 110440), (220, 81826), (251, 71720), (326, 55220), (440, 40913), (502, 35860), (652, 27610), (815, 22088), (1004, 17930), (1255, 14344), (1304, 13805), (1630, 11044), (1793, 10040), (2008, 8965), (2510, 7172), (2761, 6520), (3260, 5522), (3586, 5020)]