21972015

素因数分解:

$3^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{23}}^2\times {\mathrm{71}}^1$

素因数の和:141

約数の個数: 72

約数和(自身を含む): 43479072

約数和(自身を除く): 21507057

約数列:

[1, 3, 5, 9, 13, 15, 23, 39, 45, 65, 69, 71, 115, 117, 195, 207, 213, 299, 345, 355, 529, 585, 639, 897, 923, 1035, 1065, 1495, 1587, 1633, 2645, 2691, 2769, 3195, 4485, 4615, 4761, 4899, 6877, 7935, 8165, 8307, 13455, 13845, 14697, 20631, 21229, 23805, 24495, 34385, 37559, 41535, 61893, 63687, 73485, 103155, 106145, 112677, 187795, 191061, 309465, 318435, 338031, 488267, 563385, 955305, 1464801, 1690155, 2441335, 4394403, 7324005, 21972015]

約数ペア:

[(1, 21972015), (3, 7324005), (5, 4394403), (9, 2441335), (13, 1690155), (15, 1464801), (23, 955305), (39, 563385), (45, 488267), (65, 338031), (69, 318435), (71, 309465), (115, 191061), (117, 187795), (195, 112677), (207, 106145), (213, 103155), (299, 73485), (345, 63687), (355, 61893), (529, 41535), (585, 37559), (639, 34385), (897, 24495), (923, 23805), (1035, 21229), (1065, 20631), (1495, 14697), (1587, 13845), (1633, 13455), (2645, 8307), (2691, 8165), (2769, 7935), (3195, 6877), (4485, 4899), (4615, 4761)]