20378775

素因数分解:

$3^1\times 5^2\times {\mathrm{43}}^1\times {\mathrm{71}}^1\times {\mathrm{89}}^1$

素因数の和:216

約数の個数: 48

約数和(自身を含む): 35354880

約数和(自身を除く): 14976105

約数列:

[1, 3, 5, 15, 25, 43, 71, 75, 89, 129, 213, 215, 267, 355, 445, 645, 1065, 1075, 1335, 1775, 2225, 3053, 3225, 3827, 5325, 6319, 6675, 9159, 11481, 15265, 18957, 19135, 31595, 45795, 57405, 76325, 94785, 95675, 157975, 228975, 271717, 287025, 473925, 815151, 1358585, 4075755, 6792925, 20378775]

約数ペア:

[(1, 20378775), (3, 6792925), (5, 4075755), (15, 1358585), (25, 815151), (43, 473925), (71, 287025), (75, 271717), (89, 228975), (129, 157975), (213, 95675), (215, 94785), (267, 76325), (355, 57405), (445, 45795), (645, 31595), (1065, 19135), (1075, 18957), (1335, 15265), (1775, 11481), (2225, 9159), (3053, 6675), (3225, 6319), (3827, 5325)]