2490020

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{61}}^1\times {\mathrm{157}}^1$

素因数の和:240

約数の個数: 48

約数和(自身を含む): 5760048

約数和(自身を除く): 3270028

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 61, 65, 122, 130, 157, 244, 260, 305, 314, 610, 628, 785, 793, 1220, 1570, 1586, 2041, 3140, 3172, 3965, 4082, 7930, 8164, 9577, 10205, 15860, 19154, 20410, 38308, 40820, 47885, 95770, 124501, 191540, 249002, 498004, 622505, 1245010, 2490020]

約数ペア:

[(1, 2490020), (2, 1245010), (4, 622505), (5, 498004), (10, 249002), (13, 191540), (20, 124501), (26, 95770), (52, 47885), (61, 40820), (65, 38308), (122, 20410), (130, 19154), (157, 15860), (244, 10205), (260, 9577), (305, 8164), (314, 7930), (610, 4082), (628, 3965), (785, 3172), (793, 3140), (1220, 2041), (1570, 1586)]