21546980

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{11839}}^1$

素因数の和:11868

約数の個数: 48

約数和(自身を含む): 55695360

約数和(自身を除く): 34148380

約数列:

[1, 2, 4, 5, 7, 10, 13, 14, 20, 26, 28, 35, 52, 65, 70, 91, 130, 140, 182, 260, 364, 455, 910, 1820, 11839, 23678, 47356, 59195, 82873, 118390, 153907, 165746, 236780, 307814, 331492, 414365, 615628, 769535, 828730, 1077349, 1539070, 1657460, 2154698, 3078140, 4309396, 5386745, 10773490, 21546980]

約数ペア:

[(1, 21546980), (2, 10773490), (4, 5386745), (5, 4309396), (7, 3078140), (10, 2154698), (13, 1657460), (14, 1539070), (20, 1077349), (26, 828730), (28, 769535), (35, 615628), (52, 414365), (65, 331492), (70, 307814), (91, 236780), (130, 165746), (140, 153907), (182, 118390), (260, 82873), (364, 59195), (455, 47356), (910, 23678), (1820, 11839)]