21890908

素因数分解:

$2^2\times {\mathrm{13}}^3\times {\mathrm{47}}^1\times {\mathrm{53}}^1$

素因数の和:143

約数の個数: 48

約数和(自身を含む): 43182720

約数和(自身を除く): 21291812

約数列:

[1, 2, 4, 13, 26, 47, 52, 53, 94, 106, 169, 188, 212, 338, 611, 676, 689, 1222, 1378, 2197, 2444, 2491, 2756, 4394, 4982, 7943, 8788, 8957, 9964, 15886, 17914, 31772, 32383, 35828, 64766, 103259, 116441, 129532, 206518, 232882, 413036, 420979, 465764, 841958, 1683916, 5472727, 10945454, 21890908]

約数ペア:

[(1, 21890908), (2, 10945454), (4, 5472727), (13, 1683916), (26, 841958), (47, 465764), (52, 420979), (53, 413036), (94, 232882), (106, 206518), (169, 129532), (188, 116441), (212, 103259), (338, 64766), (611, 35828), (676, 32383), (689, 31772), (1222, 17914), (1378, 15886), (2197, 9964), (2444, 8957), (2491, 8788), (2756, 7943), (4394, 4982)]