20618955

素因数分解:

$3^4\times 5^1\times 7^2\times {\mathrm{1039}}^1$

素因数の和:1070

約数の個数: 60

約数和(自身を含む): 43037280

約数和(自身を除く): 22418325

約数列:

[1, 3, 5, 7, 9, 15, 21, 27, 35, 45, 49, 63, 81, 105, 135, 147, 189, 245, 315, 405, 441, 567, 735, 945, 1039, 1323, 2205, 2835, 3117, 3969, 5195, 6615, 7273, 9351, 15585, 19845, 21819, 28053, 36365, 46755, 50911, 65457, 84159, 109095, 140265, 152733, 196371, 254555, 327285, 420795, 458199, 589113, 763665, 981855, 1374597, 2290995, 2945565, 4123791, 6872985, 20618955]

約数ペア:

[(1, 20618955), (3, 6872985), (5, 4123791), (7, 2945565), (9, 2290995), (15, 1374597), (21, 981855), (27, 763665), (35, 589113), (45, 458199), (49, 420795), (63, 327285), (81, 254555), (105, 196371), (135, 152733), (147, 140265), (189, 109095), (245, 84159), (315, 65457), (405, 50911), (441, 46755), (567, 36365), (735, 28053), (945, 21819), (1039, 19845), (1323, 15585), (2205, 9351), (2835, 7273), (3117, 6615), (3969, 5195)]