20443540

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{61}}^1\times {\mathrm{1289}}^1$

素因数の和:1372

約数の個数: 48

約数和(自身を含む): 47028240

約数和(自身を除く): 26584700

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 61, 65, 122, 130, 244, 260, 305, 610, 793, 1220, 1289, 1586, 2578, 3172, 3965, 5156, 6445, 7930, 12890, 15860, 16757, 25780, 33514, 67028, 78629, 83785, 157258, 167570, 314516, 335140, 393145, 786290, 1022177, 1572580, 2044354, 4088708, 5110885, 10221770, 20443540]

約数ペア:

[(1, 20443540), (2, 10221770), (4, 5110885), (5, 4088708), (10, 2044354), (13, 1572580), (20, 1022177), (26, 786290), (52, 393145), (61, 335140), (65, 314516), (122, 167570), (130, 157258), (244, 83785), (260, 78629), (305, 67028), (610, 33514), (793, 25780), (1220, 16757), (1289, 15860), (1586, 12890), (2578, 7930), (3172, 6445), (3965, 5156)]