21500780

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{19}}^1\times {\mathrm{59}}^1\times {\mathrm{137}}^1$

素因数の和:231

約数の個数: 96

約数和(自身を含む): 55641600

約数和(自身を除く): 34140820

約数列:

[1, 2, 4, 5, 7, 10, 14, 19, 20, 28, 35, 38, 59, 70, 76, 95, 118, 133, 137, 140, 190, 236, 266, 274, 295, 380, 413, 532, 548, 590, 665, 685, 826, 959, 1121, 1180, 1330, 1370, 1652, 1918, 2065, 2242, 2603, 2660, 2740, 3836, 4130, 4484, 4795, 5206, 5605, 7847, 8083, 8260, 9590, 10412, 11210, 13015, 15694, 16166, 18221, 19180, 22420, 26030, 31388, 32332, 36442, 39235, 40415, 52060, 56581, 72884, 78470, 80830, 91105, 113162, 153577, 156940, 161660, 182210, 226324, 282905, 307154, 364420, 565810, 614308, 767885, 1075039, 1131620, 1535770, 2150078, 3071540, 4300156, 5375195, 10750390, 21500780]

約数ペア:

[(1, 21500780), (2, 10750390), (4, 5375195), (5, 4300156), (7, 3071540), (10, 2150078), (14, 1535770), (19, 1131620), (20, 1075039), (28, 767885), (35, 614308), (38, 565810), (59, 364420), (70, 307154), (76, 282905), (95, 226324), (118, 182210), (133, 161660), (137, 156940), (140, 153577), (190, 113162), (236, 91105), (266, 80830), (274, 78470), (295, 72884), (380, 56581), (413, 52060), (532, 40415), (548, 39235), (590, 36442), (665, 32332), (685, 31388), (826, 26030), (959, 22420), (1121, 19180), (1180, 18221), (1330, 16166), (1370, 15694), (1652, 13015), (1918, 11210), (2065, 10412), (2242, 9590), (2603, 8260), (2660, 8083), (2740, 7847), (3836, 5605), (4130, 5206), (4484, 4795)]