81230980

素因数分解:

$2^2\times 5^1\times {\mathrm{53}}^1\times {\mathrm{197}}^1\times {\mathrm{389}}^1$

素因数の和:648

約数の個数: 48

約数和(自身を含む): 175134960

約数和(自身を除く): 93903980

約数列:

[1, 2, 4, 5, 10, 20, 53, 106, 197, 212, 265, 389, 394, 530, 778, 788, 985, 1060, 1556, 1945, 1970, 3890, 3940, 7780, 10441, 20617, 20882, 41234, 41764, 52205, 76633, 82468, 103085, 104410, 153266, 206170, 208820, 306532, 383165, 412340, 766330, 1532660, 4061549, 8123098, 16246196, 20307745, 40615490, 81230980]

約数ペア:

[(1, 81230980), (2, 40615490), (4, 20307745), (5, 16246196), (10, 8123098), (20, 4061549), (53, 1532660), (106, 766330), (197, 412340), (212, 383165), (265, 306532), (389, 208820), (394, 206170), (530, 153266), (778, 104410), (788, 103085), (985, 82468), (1060, 76633), (1556, 52205), (1945, 41764), (1970, 41234), (3890, 20882), (3940, 20617), (7780, 10441)]