21990885

素因数分解:

$3^1\times 5^1\times 7^1\times {\mathrm{19}}^1\times {\mathrm{73}}^1\times {\mathrm{151}}^1$

素因数の和:258

約数の個数: 64

約数和(自身を含む): 43192320

約数和(自身を除く): 21201435

約数列:

[1, 3, 5, 7, 15, 19, 21, 35, 57, 73, 95, 105, 133, 151, 219, 285, 365, 399, 453, 511, 665, 755, 1057, 1095, 1387, 1533, 1995, 2265, 2555, 2869, 3171, 4161, 5285, 6935, 7665, 8607, 9709, 11023, 14345, 15855, 20083, 20805, 29127, 33069, 43035, 48545, 55115, 60249, 77161, 100415, 145635, 165345, 209437, 231483, 301245, 385805, 628311, 1047185, 1157415, 1466059, 3141555, 4398177, 7330295, 21990885]

約数ペア:

[(1, 21990885), (3, 7330295), (5, 4398177), (7, 3141555), (15, 1466059), (19, 1157415), (21, 1047185), (35, 628311), (57, 385805), (73, 301245), (95, 231483), (105, 209437), (133, 165345), (151, 145635), (219, 100415), (285, 77161), (365, 60249), (399, 55115), (453, 48545), (511, 43035), (665, 33069), (755, 29127), (1057, 20805), (1095, 20083), (1387, 15855), (1533, 14345), (1995, 11023), (2265, 9709), (2555, 8607), (2869, 7665), (3171, 6935), (4161, 5285)]