19919050

素因数分解:

$2^1\times 5^2\times {\mathrm{31}}^1\times {\mathrm{71}}^1\times {\mathrm{181}}^1$

素因数の和:295

約数の個数: 48

約数和(自身を含む): 38997504

約数和(自身を除く): 19078454

約数列:

[1, 2, 5, 10, 25, 31, 50, 62, 71, 142, 155, 181, 310, 355, 362, 710, 775, 905, 1550, 1775, 1810, 2201, 3550, 4402, 4525, 5611, 9050, 11005, 11222, 12851, 22010, 25702, 28055, 55025, 56110, 64255, 110050, 128510, 140275, 280550, 321275, 398381, 642550, 796762, 1991905, 3983810, 9959525, 19919050]

約数ペア:

[(1, 19919050), (2, 9959525), (5, 3983810), (10, 1991905), (25, 796762), (31, 642550), (50, 398381), (62, 321275), (71, 280550), (142, 140275), (155, 128510), (181, 110050), (310, 64255), (355, 56110), (362, 55025), (710, 28055), (775, 25702), (905, 22010), (1550, 12851), (1775, 11222), (1810, 11005), (2201, 9050), (3550, 5611), (4402, 4525)]