21333520

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{73}}^1\times {\mathrm{281}}^1$

素因数の和:380

約数の個数: 80

約数和(自身を含む): 54340272

約数和(自身を除く): 33006752

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 65, 73, 80, 104, 130, 146, 208, 260, 281, 292, 365, 520, 562, 584, 730, 949, 1040, 1124, 1168, 1405, 1460, 1898, 2248, 2810, 2920, 3653, 3796, 4496, 4745, 5620, 5840, 7306, 7592, 9490, 11240, 14612, 15184, 18265, 18980, 20513, 22480, 29224, 36530, 37960, 41026, 58448, 73060, 75920, 82052, 102565, 146120, 164104, 205130, 266669, 292240, 328208, 410260, 533338, 820520, 1066676, 1333345, 1641040, 2133352, 2666690, 4266704, 5333380, 10666760, 21333520]

約数ペア:

[(1, 21333520), (2, 10666760), (4, 5333380), (5, 4266704), (8, 2666690), (10, 2133352), (13, 1641040), (16, 1333345), (20, 1066676), (26, 820520), (40, 533338), (52, 410260), (65, 328208), (73, 292240), (80, 266669), (104, 205130), (130, 164104), (146, 146120), (208, 102565), (260, 82052), (281, 75920), (292, 73060), (365, 58448), (520, 41026), (562, 37960), (584, 36530), (730, 29224), (949, 22480), (1040, 20513), (1124, 18980), (1168, 18265), (1405, 15184), (1460, 14612), (1898, 11240), (2248, 9490), (2810, 7592), (2920, 7306), (3653, 5840), (3796, 5620), (4496, 4745)]