20916140

素因数分解:

$2^2\times 5^1\times 7^3\times {\mathrm{3049}}^1$

素因数の和:3079

約数の個数: 48

約数和(自身を含む): 51240000

約数和(自身を除く): 30323860

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 49, 70, 98, 140, 196, 245, 343, 490, 686, 980, 1372, 1715, 3049, 3430, 6098, 6860, 12196, 15245, 21343, 30490, 42686, 60980, 85372, 106715, 149401, 213430, 298802, 426860, 597604, 747005, 1045807, 1494010, 2091614, 2988020, 4183228, 5229035, 10458070, 20916140]

約数ペア:

[(1, 20916140), (2, 10458070), (4, 5229035), (5, 4183228), (7, 2988020), (10, 2091614), (14, 1494010), (20, 1045807), (28, 747005), (35, 597604), (49, 426860), (70, 298802), (98, 213430), (140, 149401), (196, 106715), (245, 85372), (343, 60980), (490, 42686), (686, 30490), (980, 21343), (1372, 15245), (1715, 12196), (3049, 6860), (3430, 6098)]