20909980

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{11489}}^1$

素因数の和:11518

約数の個数: 48

約数和(自身を含む): 54048960

約数和(自身を除く): 33138980

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, 11489, 22978, 45956, 57445, 80423, 114890, 149357, 160846, 229780, 298714, 321692, 402115, 597428, 746785, 804230, 1045499, 1493570, 1608460, 2090998, 2987140, 4181996, 5227495, 10454990, 20909980]

約数ペア:

[(1, 20909980), (2, 10454990), (4, 5227495), (5, 4181996), (7, 2987140), (10, 2090998), (13, 1608460), (14, 1493570), (20, 1045499), (26, 804230), (28, 746785), (35, 597428), (52, 402115), (65, 321692), (70, 298714), (91, 229780), (130, 160846), (140, 149357), (182, 114890), (260, 80423), (364, 57445), (455, 45956), (910, 22978), (1820, 11489)]