21872019

素因数分解:

$3^1\times {\mathrm{13}}^1\times {\mathrm{31}}^1\times {\mathrm{79}}^1\times {\mathrm{229}}^1$

素因数の和:355

約数の個数: 32

約数和(自身を含む): 32972800

約数和(自身を除く): 11100781

約数列:

[1, 3, 13, 31, 39, 79, 93, 229, 237, 403, 687, 1027, 1209, 2449, 2977, 3081, 7099, 7347, 8931, 18091, 21297, 31837, 54273, 92287, 95511, 235183, 276861, 560821, 705549, 1682463, 7290673, 21872019]

約数ペア:

[(1, 21872019), (3, 7290673), (13, 1682463), (31, 705549), (39, 560821), (79, 276861), (93, 235183), (229, 95511), (237, 92287), (403, 54273), (687, 31837), (1027, 21297), (1209, 18091), (2449, 8931), (2977, 7347), (3081, 7099)]