21520900

素因数分解:

$2^2\times 5^2\times {\mathrm{29}}^1\times {\mathrm{41}}^1\times {\mathrm{181}}^1$

素因数の和:265

約数の個数: 72

約数和(自身を含む): 49762440

約数和(自身を除く): 28241540

約数列:

[1, 2, 4, 5, 10, 20, 25, 29, 41, 50, 58, 82, 100, 116, 145, 164, 181, 205, 290, 362, 410, 580, 724, 725, 820, 905, 1025, 1189, 1450, 1810, 2050, 2378, 2900, 3620, 4100, 4525, 4756, 5249, 5945, 7421, 9050, 10498, 11890, 14842, 18100, 20996, 23780, 26245, 29684, 29725, 37105, 52490, 59450, 74210, 104980, 118900, 131225, 148420, 185525, 215209, 262450, 371050, 430418, 524900, 742100, 860836, 1076045, 2152090, 4304180, 5380225, 10760450, 21520900]

約数ペア:

[(1, 21520900), (2, 10760450), (4, 5380225), (5, 4304180), (10, 2152090), (20, 1076045), (25, 860836), (29, 742100), (41, 524900), (50, 430418), (58, 371050), (82, 262450), (100, 215209), (116, 185525), (145, 148420), (164, 131225), (181, 118900), (205, 104980), (290, 74210), (362, 59450), (410, 52490), (580, 37105), (724, 29725), (725, 29684), (820, 26245), (905, 23780), (1025, 20996), (1189, 18100), (1450, 14842), (1810, 11890), (2050, 10498), (2378, 9050), (2900, 7421), (3620, 5945), (4100, 5249), (4525, 4756)]