19911021

素因数分解:

$3^1\times {\mathrm{13}}^1\times {\mathrm{31}}^1\times {\mathrm{43}}^1\times {\mathrm{383}}^1$

素因数の和:473

約数の個数: 32

約数和(自身を含む): 30277632

約数和(自身を除く): 10366611

約数列:

[1, 3, 13, 31, 39, 43, 93, 129, 383, 403, 559, 1149, 1209, 1333, 1677, 3999, 4979, 11873, 14937, 16469, 17329, 35619, 49407, 51987, 154349, 214097, 463047, 510539, 642291, 1531617, 6637007, 19911021]

約数ペア:

[(1, 19911021), (3, 6637007), (13, 1531617), (31, 642291), (39, 510539), (43, 463047), (93, 214097), (129, 154349), (383, 51987), (403, 49407), (559, 35619), (1149, 17329), (1209, 16469), (1333, 14937), (1677, 11873), (3999, 4979)]