20818160

素因数分解:

$2^4\times 5^1\times {\mathrm{11}}^1\times {\mathrm{41}}^1\times {\mathrm{577}}^1$

素因数の和:642

約数の個数: 80

約数和(自身を含む): 54184032

約数和(自身を除く): 33365872

約数列:

[1, 2, 4, 5, 8, 10, 11, 16, 20, 22, 40, 41, 44, 55, 80, 82, 88, 110, 164, 176, 205, 220, 328, 410, 440, 451, 577, 656, 820, 880, 902, 1154, 1640, 1804, 2255, 2308, 2885, 3280, 3608, 4510, 4616, 5770, 6347, 7216, 9020, 9232, 11540, 12694, 18040, 23080, 23657, 25388, 31735, 36080, 46160, 47314, 50776, 63470, 94628, 101552, 118285, 126940, 189256, 236570, 253880, 260227, 378512, 473140, 507760, 520454, 946280, 1040908, 1301135, 1892560, 2081816, 2602270, 4163632, 5204540, 10409080, 20818160]

約数ペア:

[(1, 20818160), (2, 10409080), (4, 5204540), (5, 4163632), (8, 2602270), (10, 2081816), (11, 1892560), (16, 1301135), (20, 1040908), (22, 946280), (40, 520454), (41, 507760), (44, 473140), (55, 378512), (80, 260227), (82, 253880), (88, 236570), (110, 189256), (164, 126940), (176, 118285), (205, 101552), (220, 94628), (328, 63470), (410, 50776), (440, 47314), (451, 46160), (577, 36080), (656, 31735), (820, 25388), (880, 23657), (902, 23080), (1154, 18040), (1640, 12694), (1804, 11540), (2255, 9232), (2308, 9020), (2885, 7216), (3280, 6347), (3608, 5770), (4510, 4616)]