21900255

素因数分解:

$3^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{23}}^1\times {\mathrm{257}}^1$

素因数の和:320

約数の個数: 64

約数和(自身を含む): 41610240

約数和(自身を除く): 19709985

約数列:

[1, 3, 5, 13, 15, 19, 23, 39, 57, 65, 69, 95, 115, 195, 247, 257, 285, 299, 345, 437, 741, 771, 897, 1235, 1285, 1311, 1495, 2185, 3341, 3705, 3855, 4485, 4883, 5681, 5911, 6555, 10023, 14649, 16705, 17043, 17733, 24415, 28405, 29555, 50115, 63479, 73245, 76843, 85215, 88665, 112309, 190437, 230529, 317395, 336927, 384215, 561545, 952185, 1152645, 1460017, 1684635, 4380051, 7300085, 21900255]

約数ペア:

[(1, 21900255), (3, 7300085), (5, 4380051), (13, 1684635), (15, 1460017), (19, 1152645), (23, 952185), (39, 561545), (57, 384215), (65, 336927), (69, 317395), (95, 230529), (115, 190437), (195, 112309), (247, 88665), (257, 85215), (285, 76843), (299, 73245), (345, 63479), (437, 50115), (741, 29555), (771, 28405), (897, 24415), (1235, 17733), (1285, 17043), (1311, 16705), (1495, 14649), (2185, 10023), (3341, 6555), (3705, 5911), (3855, 5681), (4485, 4883)]