21317985

素因数分解:

$3^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{4049}}^1$

素因数の和:4079

約数の個数: 40

約数和(自身を含む): 41164200

約数和(自身を除く): 19846215

約数列:

[1, 3, 5, 9, 13, 15, 27, 39, 45, 65, 81, 117, 135, 195, 351, 405, 585, 1053, 1755, 4049, 5265, 12147, 20245, 36441, 52637, 60735, 109323, 157911, 182205, 263185, 327969, 473733, 546615, 789555, 1421199, 1639845, 2368665, 4263597, 7105995, 21317985]

約数ペア:

[(1, 21317985), (3, 7105995), (5, 4263597), (9, 2368665), (13, 1639845), (15, 1421199), (27, 789555), (39, 546615), (45, 473733), (65, 327969), (81, 263185), (117, 182205), (135, 157911), (195, 109323), (351, 60735), (405, 52637), (585, 36441), (1053, 20245), (1755, 12147), (4049, 5265)]