21122440

素因数分解:

$2^3\times 5^1\times {\mathrm{29}}^1\times {\mathrm{131}}^1\times {\mathrm{139}}^1$

素因数の和:310

約数の個数: 64

約数和(自身を含む): 49896000

約数和(自身を除く): 28773560

約数列:

[1, 2, 4, 5, 8, 10, 20, 29, 40, 58, 116, 131, 139, 145, 232, 262, 278, 290, 524, 556, 580, 655, 695, 1048, 1112, 1160, 1310, 1390, 2620, 2780, 3799, 4031, 5240, 5560, 7598, 8062, 15196, 16124, 18209, 18995, 20155, 30392, 32248, 36418, 37990, 40310, 72836, 75980, 80620, 91045, 145672, 151960, 161240, 182090, 364180, 528061, 728360, 1056122, 2112244, 2640305, 4224488, 5280610, 10561220, 21122440]

約数ペア:

[(1, 21122440), (2, 10561220), (4, 5280610), (5, 4224488), (8, 2640305), (10, 2112244), (20, 1056122), (29, 728360), (40, 528061), (58, 364180), (116, 182090), (131, 161240), (139, 151960), (145, 145672), (232, 91045), (262, 80620), (278, 75980), (290, 72836), (524, 40310), (556, 37990), (580, 36418), (655, 32248), (695, 30392), (1048, 20155), (1112, 18995), (1160, 18209), (1310, 16124), (1390, 15196), (2620, 8062), (2780, 7598), (3799, 5560), (4031, 5240)]