21401980

素因数分解:

$2^2\times 5^1\times {\mathrm{17}}^1\times {\mathrm{19}}^1\times {\mathrm{3313}}^1$

素因数の和:3358

約数の個数: 48

約数和(自身を含む): 50107680

約数和(自身を除く): 28705700

約数列:

[1, 2, 4, 5, 10, 17, 19, 20, 34, 38, 68, 76, 85, 95, 170, 190, 323, 340, 380, 646, 1292, 1615, 3230, 3313, 6460, 6626, 13252, 16565, 33130, 56321, 62947, 66260, 112642, 125894, 225284, 251788, 281605, 314735, 563210, 629470, 1070099, 1126420, 1258940, 2140198, 4280396, 5350495, 10700990, 21401980]

約数ペア:

[(1, 21401980), (2, 10700990), (4, 5350495), (5, 4280396), (10, 2140198), (17, 1258940), (19, 1126420), (20, 1070099), (34, 629470), (38, 563210), (68, 314735), (76, 281605), (85, 251788), (95, 225284), (170, 125894), (190, 112642), (323, 66260), (340, 62947), (380, 56321), (646, 33130), (1292, 16565), (1615, 13252), (3230, 6626), (3313, 6460)]