19809140

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{61}}^1\times {\mathrm{1249}}^1$

素因数の和:1332

約数の個数: 48

約数和(自身を含む): 45570000

約数和(自身を除く): 25760860

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 61, 65, 122, 130, 244, 260, 305, 610, 793, 1220, 1249, 1586, 2498, 3172, 3965, 4996, 6245, 7930, 12490, 15860, 16237, 24980, 32474, 64948, 76189, 81185, 152378, 162370, 304756, 324740, 380945, 761890, 990457, 1523780, 1980914, 3961828, 4952285, 9904570, 19809140]

約数ペア:

[(1, 19809140), (2, 9904570), (4, 4952285), (5, 3961828), (10, 1980914), (13, 1523780), (20, 990457), (26, 761890), (52, 380945), (61, 324740), (65, 304756), (122, 162370), (130, 152378), (244, 81185), (260, 76189), (305, 64948), (610, 32474), (793, 24980), (1220, 16237), (1249, 15860), (1586, 12490), (2498, 7930), (3172, 6245), (3965, 4996)]