81818980

素因数分解:

$2^2\times 5^1\times {\mathrm{71}}^1\times {\mathrm{157}}^1\times {\mathrm{367}}^1$

素因数の和:604

約数の個数: 48

約数和(自身を含む): 175827456

約数和(自身を除く): 94008476

約数列:

[1, 2, 4, 5, 10, 20, 71, 142, 157, 284, 314, 355, 367, 628, 710, 734, 785, 1420, 1468, 1570, 1835, 3140, 3670, 7340, 11147, 22294, 26057, 44588, 52114, 55735, 57619, 104228, 111470, 115238, 130285, 222940, 230476, 260570, 288095, 521140, 576190, 1152380, 4090949, 8181898, 16363796, 20454745, 40909490, 81818980]

約数ペア:

[(1, 81818980), (2, 40909490), (4, 20454745), (5, 16363796), (10, 8181898), (20, 4090949), (71, 1152380), (142, 576190), (157, 521140), (284, 288095), (314, 260570), (355, 230476), (367, 222940), (628, 130285), (710, 115238), (734, 111470), (785, 104228), (1420, 57619), (1468, 55735), (1570, 52114), (1835, 44588), (3140, 26057), (3670, 22294), (7340, 11147)]