19707880

素因数分解:

$2^3\times 5^1\times {\mathrm{41}}^1\times {\mathrm{61}}^1\times {\mathrm{197}}^1$

素因数の和:310

約数の個数: 64

約数和(自身を含む): 46403280

約数和(自身を除く): 26695400

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 41, 61, 82, 122, 164, 197, 205, 244, 305, 328, 394, 410, 488, 610, 788, 820, 985, 1220, 1576, 1640, 1970, 2440, 2501, 3940, 5002, 7880, 8077, 10004, 12017, 12505, 16154, 20008, 24034, 25010, 32308, 40385, 48068, 50020, 60085, 64616, 80770, 96136, 100040, 120170, 161540, 240340, 323080, 480680, 492697, 985394, 1970788, 2463485, 3941576, 4926970, 9853940, 19707880]

約数ペア:

[(1, 19707880), (2, 9853940), (4, 4926970), (5, 3941576), (8, 2463485), (10, 1970788), (20, 985394), (40, 492697), (41, 480680), (61, 323080), (82, 240340), (122, 161540), (164, 120170), (197, 100040), (205, 96136), (244, 80770), (305, 64616), (328, 60085), (394, 50020), (410, 48068), (488, 40385), (610, 32308), (788, 25010), (820, 24034), (985, 20008), (1220, 16154), (1576, 12505), (1640, 12017), (1970, 10004), (2440, 8077), (2501, 7880), (3940, 5002)]