21060520

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{101}}^1\times {\mathrm{401}}^1$

素因数の和:526

約数の個数: 64

約数和(自身を含む): 51665040

約数和(自身を除く): 30604520

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 26, 40, 52, 65, 101, 104, 130, 202, 260, 401, 404, 505, 520, 802, 808, 1010, 1313, 1604, 2005, 2020, 2626, 3208, 4010, 4040, 5213, 5252, 6565, 8020, 10426, 10504, 13130, 16040, 20852, 26065, 26260, 40501, 41704, 52130, 52520, 81002, 104260, 162004, 202505, 208520, 324008, 405010, 526513, 810020, 1053026, 1620040, 2106052, 2632565, 4212104, 5265130, 10530260, 21060520]

約数ペア:

[(1, 21060520), (2, 10530260), (4, 5265130), (5, 4212104), (8, 2632565), (10, 2106052), (13, 1620040), (20, 1053026), (26, 810020), (40, 526513), (52, 405010), (65, 324008), (101, 208520), (104, 202505), (130, 162004), (202, 104260), (260, 81002), (401, 52520), (404, 52130), (505, 41704), (520, 40501), (802, 26260), (808, 26065), (1010, 20852), (1313, 16040), (1604, 13130), (2005, 10504), (2020, 10426), (2626, 8020), (3208, 6565), (4010, 5252), (4040, 5213)]