21191860

素因数分解:

$2^2\times 5^1\times {\mathrm{17}}^1\times {\mathrm{157}}^1\times {\mathrm{397}}^1$

素因数の和:580

約数の個数: 48

約数和(自身を含む): 47540304

約数和(自身を除く): 26348444

約数列:

[1, 2, 4, 5, 10, 17, 20, 34, 68, 85, 157, 170, 314, 340, 397, 628, 785, 794, 1570, 1588, 1985, 2669, 3140, 3970, 5338, 6749, 7940, 10676, 13345, 13498, 26690, 26996, 33745, 53380, 62329, 67490, 124658, 134980, 249316, 311645, 623290, 1059593, 1246580, 2119186, 4238372, 5297965, 10595930, 21191860]

約数ペア:

[(1, 21191860), (2, 10595930), (4, 5297965), (5, 4238372), (10, 2119186), (17, 1246580), (20, 1059593), (34, 623290), (68, 311645), (85, 249316), (157, 134980), (170, 124658), (314, 67490), (340, 62329), (397, 53380), (628, 33745), (785, 26996), (794, 26690), (1570, 13498), (1588, 13345), (1985, 10676), (2669, 7940), (3140, 6749), (3970, 5338)]