21119660

素因数分解:

$2^2\times 5^1\times {\mathrm{71}}^1\times {\mathrm{107}}^1\times {\mathrm{139}}^1$

素因数の和:326

約数の個数: 48

約数和(自身を含む): 45722880

約数和(自身を除く): 24603220

約数列:

[1, 2, 4, 5, 10, 20, 71, 107, 139, 142, 214, 278, 284, 355, 428, 535, 556, 695, 710, 1070, 1390, 1420, 2140, 2780, 7597, 9869, 14873, 15194, 19738, 29746, 30388, 37985, 39476, 49345, 59492, 74365, 75970, 98690, 148730, 151940, 197380, 297460, 1055983, 2111966, 4223932, 5279915, 10559830, 21119660]

約数ペア:

[(1, 21119660), (2, 10559830), (4, 5279915), (5, 4223932), (10, 2111966), (20, 1055983), (71, 297460), (107, 197380), (139, 151940), (142, 148730), (214, 98690), (278, 75970), (284, 74365), (355, 59492), (428, 49345), (535, 39476), (556, 37985), (695, 30388), (710, 29746), (1070, 19738), (1390, 15194), (1420, 14873), (2140, 9869), (2780, 7597)]