21479720

素因数分解:

$2^3\times 5^1\times {\mathrm{29}}^1\times {\mathrm{18517}}^1$

素因数の和:18557

約数の個数: 32

約数和(自身を含む): 49998600

約数和(自身を除く): 28518880

約数列:

[1, 2, 4, 5, 8, 10, 20, 29, 40, 58, 116, 145, 232, 290, 580, 1160, 18517, 37034, 74068, 92585, 148136, 185170, 370340, 536993, 740680, 1073986, 2147972, 2684965, 4295944, 5369930, 10739860, 21479720]

約数ペア:

[(1, 21479720), (2, 10739860), (4, 5369930), (5, 4295944), (8, 2684965), (10, 2147972), (20, 1073986), (29, 740680), (40, 536993), (58, 370340), (116, 185170), (145, 148136), (232, 92585), (290, 74068), (580, 37034), (1160, 18517)]