19946680

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{89}}^1\times {\mathrm{431}}^1$

素因数の和:544

約数の個数: 64

約数和(自身を含む): 48988800

約数和(自身を除く): 29042120

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 26, 40, 52, 65, 89, 104, 130, 178, 260, 356, 431, 445, 520, 712, 862, 890, 1157, 1724, 1780, 2155, 2314, 3448, 3560, 4310, 4628, 5603, 5785, 8620, 9256, 11206, 11570, 17240, 22412, 23140, 28015, 38359, 44824, 46280, 56030, 76718, 112060, 153436, 191795, 224120, 306872, 383590, 498667, 767180, 997334, 1534360, 1994668, 2493335, 3989336, 4986670, 9973340, 19946680]

約数ペア:

[(1, 19946680), (2, 9973340), (4, 4986670), (5, 3989336), (8, 2493335), (10, 1994668), (13, 1534360), (20, 997334), (26, 767180), (40, 498667), (52, 383590), (65, 306872), (89, 224120), (104, 191795), (130, 153436), (178, 112060), (260, 76718), (356, 56030), (431, 46280), (445, 44824), (520, 38359), (712, 28015), (862, 23140), (890, 22412), (1157, 17240), (1724, 11570), (1780, 11206), (2155, 9256), (2314, 8620), (3448, 5785), (3560, 5603), (4310, 4628)]