21478040

素因数分解:

$2^3\times 5^1\times {\mathrm{31}}^1\times {\mathrm{17321}}^1$

素因数の和:17363

約数の個数: 32

約数和(自身を含む): 49887360

約数和(自身を除く): 28409320

約数列:

[1, 2, 4, 5, 8, 10, 20, 31, 40, 62, 124, 155, 248, 310, 620, 1240, 17321, 34642, 69284, 86605, 138568, 173210, 346420, 536951, 692840, 1073902, 2147804, 2684755, 4295608, 5369510, 10739020, 21478040]

約数ペア:

[(1, 21478040), (2, 10739020), (4, 5369510), (5, 4295608), (8, 2684755), (10, 2147804), (20, 1073902), (31, 692840), (40, 536951), (62, 346420), (124, 173210), (155, 138568), (248, 86605), (310, 69284), (620, 34642), (1240, 17321)]