19781320

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{109}}^1\times {\mathrm{349}}^1$

素因数の和:482

約数の個数: 64

約数和(自身を含む): 48510000

約数和(自身を除く): 28728680

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 26, 40, 52, 65, 104, 109, 130, 218, 260, 349, 436, 520, 545, 698, 872, 1090, 1396, 1417, 1745, 2180, 2792, 2834, 3490, 4360, 4537, 5668, 6980, 7085, 9074, 11336, 13960, 14170, 18148, 22685, 28340, 36296, 38041, 45370, 56680, 76082, 90740, 152164, 181480, 190205, 304328, 380410, 494533, 760820, 989066, 1521640, 1978132, 2472665, 3956264, 4945330, 9890660, 19781320]

約数ペア:

[(1, 19781320), (2, 9890660), (4, 4945330), (5, 3956264), (8, 2472665), (10, 1978132), (13, 1521640), (20, 989066), (26, 760820), (40, 494533), (52, 380410), (65, 304328), (104, 190205), (109, 181480), (130, 152164), (218, 90740), (260, 76082), (349, 56680), (436, 45370), (520, 38041), (545, 36296), (698, 28340), (872, 22685), (1090, 18148), (1396, 14170), (1417, 13960), (1745, 11336), (2180, 9074), (2792, 7085), (2834, 6980), (3490, 5668), (4360, 4537)]