20641790

素因数分解:

$2^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{61}}^1\times {\mathrm{137}}^1$

素因数の和:237

約数の個数: 64

約数和(自身を含む): 43122240

約数和(自身を除く): 22480450

約数列:

[1, 2, 5, 10, 13, 19, 26, 38, 61, 65, 95, 122, 130, 137, 190, 247, 274, 305, 494, 610, 685, 793, 1159, 1235, 1370, 1586, 1781, 2318, 2470, 2603, 3562, 3965, 5206, 5795, 7930, 8357, 8905, 11590, 13015, 15067, 16714, 17810, 26030, 30134, 33839, 41785, 67678, 75335, 83570, 108641, 150670, 158783, 169195, 217282, 317566, 338390, 543205, 793915, 1086410, 1587830, 2064179, 4128358, 10320895, 20641790]

約数ペア:

[(1, 20641790), (2, 10320895), (5, 4128358), (10, 2064179), (13, 1587830), (19, 1086410), (26, 793915), (38, 543205), (61, 338390), (65, 317566), (95, 217282), (122, 169195), (130, 158783), (137, 150670), (190, 108641), (247, 83570), (274, 75335), (305, 67678), (494, 41785), (610, 33839), (685, 30134), (793, 26030), (1159, 17810), (1235, 16714), (1370, 15067), (1586, 13015), (1781, 11590), (2318, 8905), (2470, 8357), (2603, 7930), (3562, 5795), (3965, 5206)]