21215818

素因数分解:

$2^1\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{67}}^1\times {\mathrm{641}}^1$

素因数の和:742

約数の個数: 32

約数和(自身を含む): 36671040

約数和(自身を除く): 15455222

約数列:

[1, 2, 13, 19, 26, 38, 67, 134, 247, 494, 641, 871, 1273, 1282, 1742, 2546, 8333, 12179, 16549, 16666, 24358, 33098, 42947, 85894, 158327, 316654, 558311, 815993, 1116622, 1631986, 10607909, 21215818]

約数ペア:

[(1, 21215818), (2, 10607909), (13, 1631986), (19, 1116622), (26, 815993), (38, 558311), (67, 316654), (134, 158327), (247, 85894), (494, 42947), (641, 33098), (871, 24358), (1273, 16666), (1282, 16549), (1742, 12179), (2546, 8333)]