20720925

素因数分解:

$3^2\times 5^2\times {\mathrm{19}}^1\times {\mathrm{37}}^1\times {\mathrm{131}}^1$

素因数の和:203

約数の個数: 72

約数和(自身を含む): 40428960

約数和(自身を除く): 19708035

約数列:

[1, 3, 5, 9, 15, 19, 25, 37, 45, 57, 75, 95, 111, 131, 171, 185, 225, 285, 333, 393, 475, 555, 655, 703, 855, 925, 1179, 1425, 1665, 1965, 2109, 2489, 2775, 3275, 3515, 4275, 4847, 5895, 6327, 7467, 8325, 9825, 10545, 12445, 14541, 17575, 22401, 24235, 29475, 31635, 37335, 43623, 52725, 62225, 72705, 92093, 112005, 121175, 158175, 186675, 218115, 276279, 363525, 460465, 560025, 828837, 1090575, 1381395, 2302325, 4144185, 6906975, 20720925]

約数ペア:

[(1, 20720925), (3, 6906975), (5, 4144185), (9, 2302325), (15, 1381395), (19, 1090575), (25, 828837), (37, 560025), (45, 460465), (57, 363525), (75, 276279), (95, 218115), (111, 186675), (131, 158175), (171, 121175), (185, 112005), (225, 92093), (285, 72705), (333, 62225), (393, 52725), (475, 43623), (555, 37335), (655, 31635), (703, 29475), (855, 24235), (925, 22401), (1179, 17575), (1425, 14541), (1665, 12445), (1965, 10545), (2109, 9825), (2489, 8325), (2775, 7467), (3275, 6327), (3515, 5895), (4275, 4847)]