21203715

素因数分解:

$3^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{59}}^1\times {\mathrm{97}}^1$

素因数の和:196

約数の個数: 64

約数和(自身を含む): 39513600

約数和(自身を除く): 18309885

約数列:

[1, 3, 5, 13, 15, 19, 39, 57, 59, 65, 95, 97, 177, 195, 247, 285, 291, 295, 485, 741, 767, 885, 1121, 1235, 1261, 1455, 1843, 2301, 3363, 3705, 3783, 3835, 5529, 5605, 5723, 6305, 9215, 11505, 14573, 16815, 17169, 18915, 23959, 27645, 28615, 43719, 71877, 72865, 74399, 85845, 108737, 119795, 218595, 223197, 326211, 359385, 371995, 543685, 1115985, 1413581, 1631055, 4240743, 7067905, 21203715]

約数ペア:

[(1, 21203715), (3, 7067905), (5, 4240743), (13, 1631055), (15, 1413581), (19, 1115985), (39, 543685), (57, 371995), (59, 359385), (65, 326211), (95, 223197), (97, 218595), (177, 119795), (195, 108737), (247, 85845), (285, 74399), (291, 72865), (295, 71877), (485, 43719), (741, 28615), (767, 27645), (885, 23959), (1121, 18915), (1235, 17169), (1261, 16815), (1455, 14573), (1843, 11505), (2301, 9215), (3363, 6305), (3705, 5723), (3783, 5605), (3835, 5529)]