20749995

素因数分解:

$3^2\times 5^1\times 7^1\times {\mathrm{19}}^1\times {\mathrm{3467}}^1$

素因数の和:3504

約数の個数: 48

約数和(自身を含む): 43280640

約数和(自身を除く): 22530645

約数列:

[1, 3, 5, 7, 9, 15, 19, 21, 35, 45, 57, 63, 95, 105, 133, 171, 285, 315, 399, 665, 855, 1197, 1995, 3467, 5985, 10401, 17335, 24269, 31203, 52005, 65873, 72807, 121345, 156015, 197619, 218421, 329365, 364035, 461111, 592857, 988095, 1092105, 1383333, 2305555, 2964285, 4149999, 6916665, 20749995]

約数ペア:

[(1, 20749995), (3, 6916665), (5, 4149999), (7, 2964285), (9, 2305555), (15, 1383333), (19, 1092105), (21, 988095), (35, 592857), (45, 461111), (57, 364035), (63, 329365), (95, 218421), (105, 197619), (133, 156015), (171, 121345), (285, 72807), (315, 65873), (399, 52005), (665, 31203), (855, 24269), (1197, 17335), (1995, 10401), (3467, 5985)]