20827980

素因数分解:

$2^2\times 3^2\times 5^1\times {\mathrm{251}}^1\times {\mathrm{461}}^1$

素因数の和:727

約数の個数: 72

約数和(自身を含む): 63567504

約数和(自身を除く): 42739524

約数列:

[1, 2, 3, 4, 5, 6, 9, 10, 12, 15, 18, 20, 30, 36, 45, 60, 90, 180, 251, 461, 502, 753, 922, 1004, 1255, 1383, 1506, 1844, 2259, 2305, 2510, 2766, 3012, 3765, 4149, 4518, 4610, 5020, 5532, 6915, 7530, 8298, 9036, 9220, 11295, 13830, 15060, 16596, 20745, 22590, 27660, 41490, 45180, 82980, 115711, 231422, 347133, 462844, 578555, 694266, 1041399, 1157110, 1388532, 1735665, 2082798, 2314220, 3471330, 4165596, 5206995, 6942660, 10413990, 20827980]

約数ペア:

[(1, 20827980), (2, 10413990), (3, 6942660), (4, 5206995), (5, 4165596), (6, 3471330), (9, 2314220), (10, 2082798), (12, 1735665), (15, 1388532), (18, 1157110), (20, 1041399), (30, 694266), (36, 578555), (45, 462844), (60, 347133), (90, 231422), (180, 115711), (251, 82980), (461, 45180), (502, 41490), (753, 27660), (922, 22590), (1004, 20745), (1255, 16596), (1383, 15060), (1506, 13830), (1844, 11295), (2259, 9220), (2305, 9036), (2510, 8298), (2766, 7530), (3012, 6915), (3765, 5532), (4149, 5020), (4518, 4610)]