20987590

素因数分解:

$2^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{29}}^1\times {\mathrm{293}}^1$

素因数の和:361

約数の個数: 64

約数和(自身を含む): 44452800

約数和(自身を除く): 23465210

約数列:

[1, 2, 5, 10, 13, 19, 26, 29, 38, 58, 65, 95, 130, 145, 190, 247, 290, 293, 377, 494, 551, 586, 754, 1102, 1235, 1465, 1885, 2470, 2755, 2930, 3770, 3809, 5510, 5567, 7163, 7618, 8497, 11134, 14326, 16994, 19045, 27835, 35815, 38090, 42485, 55670, 71630, 72371, 84970, 110461, 144742, 161443, 220922, 322886, 361855, 552305, 723710, 807215, 1104610, 1614430, 2098759, 4197518, 10493795, 20987590]

約数ペア:

[(1, 20987590), (2, 10493795), (5, 4197518), (10, 2098759), (13, 1614430), (19, 1104610), (26, 807215), (29, 723710), (38, 552305), (58, 361855), (65, 322886), (95, 220922), (130, 161443), (145, 144742), (190, 110461), (247, 84970), (290, 72371), (293, 71630), (377, 55670), (494, 42485), (551, 38090), (586, 35815), (754, 27835), (1102, 19045), (1235, 16994), (1465, 14326), (1885, 11134), (2470, 8497), (2755, 7618), (2930, 7163), (3770, 5567), (3809, 5510)]