21015855

素因数分解:

$3^5\times 5^1\times 7^2\times {\mathrm{353}}^1$

素因数の和:387

約数の個数: 72

約数和(自身を含む): 44068752

約数和(自身を除く): 23052897

約数列:

[1, 3, 5, 7, 9, 15, 21, 27, 35, 45, 49, 63, 81, 105, 135, 147, 189, 243, 245, 315, 353, 405, 441, 567, 735, 945, 1059, 1215, 1323, 1701, 1765, 2205, 2471, 2835, 3177, 3969, 5295, 6615, 7413, 8505, 9531, 11907, 12355, 15885, 17297, 19845, 22239, 28593, 37065, 47655, 51891, 59535, 66717, 85779, 86485, 111195, 142965, 155673, 200151, 259455, 333585, 428895, 467019, 600453, 778365, 1000755, 1401057, 2335095, 3002265, 4203171, 7005285, 21015855]

約数ペア:

[(1, 21015855), (3, 7005285), (5, 4203171), (7, 3002265), (9, 2335095), (15, 1401057), (21, 1000755), (27, 778365), (35, 600453), (45, 467019), (49, 428895), (63, 333585), (81, 259455), (105, 200151), (135, 155673), (147, 142965), (189, 111195), (243, 86485), (245, 85779), (315, 66717), (353, 59535), (405, 51891), (441, 47655), (567, 37065), (735, 28593), (945, 22239), (1059, 19845), (1215, 17297), (1323, 15885), (1701, 12355), (1765, 11907), (2205, 9531), (2471, 8505), (2835, 7413), (3177, 6615), (3969, 5295)]