21903560

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{137}}^1\times {\mathrm{571}}^1$

素因数の和:726

約数の個数: 64

約数和(自身を含む): 56833920

約数和(自身を除く): 34930360

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 137, 140, 274, 280, 548, 571, 685, 959, 1096, 1142, 1370, 1918, 2284, 2740, 2855, 3836, 3997, 4568, 4795, 5480, 5710, 7672, 7994, 9590, 11420, 15988, 19180, 19985, 22840, 31976, 38360, 39970, 78227, 79940, 156454, 159880, 312908, 391135, 547589, 625816, 782270, 1095178, 1564540, 2190356, 2737945, 3129080, 4380712, 5475890, 10951780, 21903560]

約数ペア:

[(1, 21903560), (2, 10951780), (4, 5475890), (5, 4380712), (7, 3129080), (8, 2737945), (10, 2190356), (14, 1564540), (20, 1095178), (28, 782270), (35, 625816), (40, 547589), (56, 391135), (70, 312908), (137, 159880), (140, 156454), (274, 79940), (280, 78227), (548, 39970), (571, 38360), (685, 31976), (959, 22840), (1096, 19985), (1142, 19180), (1370, 15988), (1918, 11420), (2284, 9590), (2740, 7994), (2855, 7672), (3836, 5710), (3997, 5480), (4568, 4795)]