21557991

素因数分解:

$3^1\times 7^2\times {\mathrm{13}}^1\times {\mathrm{29}}^1\times {\mathrm{389}}^1$

素因数の和:448

約数の個数: 48

約数和(自身を含む): 37346400

約数和(自身を除く): 15788409

約数列:

[1, 3, 7, 13, 21, 29, 39, 49, 87, 91, 147, 203, 273, 377, 389, 609, 637, 1131, 1167, 1421, 1911, 2639, 2723, 4263, 5057, 7917, 8169, 11281, 15171, 18473, 19061, 33843, 35399, 55419, 57183, 78967, 106197, 146653, 236901, 247793, 439959, 552769, 743379, 1026571, 1658307, 3079713, 7185997, 21557991]

約数ペア:

[(1, 21557991), (3, 7185997), (7, 3079713), (13, 1658307), (21, 1026571), (29, 743379), (39, 552769), (49, 439959), (87, 247793), (91, 236901), (147, 146653), (203, 106197), (273, 78967), (377, 57183), (389, 55419), (609, 35399), (637, 33843), (1131, 19061), (1167, 18473), (1421, 15171), (1911, 11281), (2639, 8169), (2723, 7917), (4263, 5057)]