20451990

素因数分解:

$2^1\times 3^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{229}}^2$

素因数の和:481

約数の個数: 48

約数和(自身を含む): 53092368

約数和(自身を除く): 32640378

約数列:

[1, 2, 3, 5, 6, 10, 13, 15, 26, 30, 39, 65, 78, 130, 195, 229, 390, 458, 687, 1145, 1374, 2290, 2977, 3435, 5954, 6870, 8931, 14885, 17862, 29770, 44655, 52441, 89310, 104882, 157323, 262205, 314646, 524410, 681733, 786615, 1363466, 1573230, 2045199, 3408665, 4090398, 6817330, 10225995, 20451990]

約数ペア:

[(1, 20451990), (2, 10225995), (3, 6817330), (5, 4090398), (6, 3408665), (10, 2045199), (13, 1573230), (15, 1363466), (26, 786615), (30, 681733), (39, 524410), (65, 314646), (78, 262205), (130, 157323), (195, 104882), (229, 89310), (390, 52441), (458, 44655), (687, 29770), (1145, 17862), (1374, 14885), (2290, 8931), (2977, 6870), (3435, 5954)]