20779720

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{89}}^1\times {\mathrm{449}}^1$

素因数の和:562

約数の個数: 64

約数和(自身を含む): 51030000

約数和(自身を除く): 30250280

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 26, 40, 52, 65, 89, 104, 130, 178, 260, 356, 445, 449, 520, 712, 890, 898, 1157, 1780, 1796, 2245, 2314, 3560, 3592, 4490, 4628, 5785, 5837, 8980, 9256, 11570, 11674, 17960, 23140, 23348, 29185, 39961, 46280, 46696, 58370, 79922, 116740, 159844, 199805, 233480, 319688, 399610, 519493, 799220, 1038986, 1598440, 2077972, 2597465, 4155944, 5194930, 10389860, 20779720]

約数ペア:

[(1, 20779720), (2, 10389860), (4, 5194930), (5, 4155944), (8, 2597465), (10, 2077972), (13, 1598440), (20, 1038986), (26, 799220), (40, 519493), (52, 399610), (65, 319688), (89, 233480), (104, 199805), (130, 159844), (178, 116740), (260, 79922), (356, 58370), (445, 46696), (449, 46280), (520, 39961), (712, 29185), (890, 23348), (898, 23140), (1157, 17960), (1780, 11674), (1796, 11570), (2245, 9256), (2314, 8980), (3560, 5837), (3592, 5785), (4490, 4628)]