21686780

素因数分解:

$2^2\times 5^1\times {\mathrm{29}}^1\times {\mathrm{139}}^1\times {\mathrm{269}}^1$

素因数の和:446

約数の個数: 48

約数和(自身を含む): 47628000

約数和(自身を除く): 25941220

約数列:

[1, 2, 4, 5, 10, 20, 29, 58, 116, 139, 145, 269, 278, 290, 538, 556, 580, 695, 1076, 1345, 1390, 2690, 2780, 4031, 5380, 7801, 8062, 15602, 16124, 20155, 31204, 37391, 39005, 40310, 74782, 78010, 80620, 149564, 156020, 186955, 373910, 747820, 1084339, 2168678, 4337356, 5421695, 10843390, 21686780]

約数ペア:

[(1, 21686780), (2, 10843390), (4, 5421695), (5, 4337356), (10, 2168678), (20, 1084339), (29, 747820), (58, 373910), (116, 186955), (139, 156020), (145, 149564), (269, 80620), (278, 78010), (290, 74782), (538, 40310), (556, 39005), (580, 37391), (695, 31204), (1076, 20155), (1345, 16124), (1390, 15602), (2690, 8062), (2780, 7801), (4031, 5380)]