640900

素因数分解:

$2^2\times 5^2\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{29}}^1$

素因数の和:73

約数の個数: 72

約数和(自身を含む): 1640520

約数和(自身を除く): 999620

約数列:

[1, 2, 4, 5, 10, 13, 17, 20, 25, 26, 29, 34, 50, 52, 58, 65, 68, 85, 100, 116, 130, 145, 170, 221, 260, 290, 325, 340, 377, 425, 442, 493, 580, 650, 725, 754, 850, 884, 986, 1105, 1300, 1450, 1508, 1700, 1885, 1972, 2210, 2465, 2900, 3770, 4420, 4930, 5525, 6409, 7540, 9425, 9860, 11050, 12325, 12818, 18850, 22100, 24650, 25636, 32045, 37700, 49300, 64090, 128180, 160225, 320450, 640900]

約数ペア:

[(1, 640900), (2, 320450), (4, 160225), (5, 128180), (10, 64090), (13, 49300), (17, 37700), (20, 32045), (25, 25636), (26, 24650), (29, 22100), (34, 18850), (50, 12818), (52, 12325), (58, 11050), (65, 9860), (68, 9425), (85, 7540), (100, 6409), (116, 5525), (130, 4930), (145, 4420), (170, 3770), (221, 2900), (260, 2465), (290, 2210), (325, 1972), (340, 1885), (377, 1700), (425, 1508), (442, 1450), (493, 1300), (580, 1105), (650, 986), (725, 884), (754, 850)]