21781448

素因数分解:

$2^3\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{73}}^1\times {\mathrm{151}}^1$

素因数の和:262

約数の個数: 64

約数和(自身を含む): 47241600

約数和(自身を除く): 25460152

約数列:

[1, 2, 4, 8, 13, 19, 26, 38, 52, 73, 76, 104, 146, 151, 152, 247, 292, 302, 494, 584, 604, 949, 988, 1208, 1387, 1898, 1963, 1976, 2774, 2869, 3796, 3926, 5548, 5738, 7592, 7852, 11023, 11096, 11476, 15704, 18031, 22046, 22952, 36062, 37297, 44092, 72124, 74594, 88184, 143299, 144248, 149188, 209437, 286598, 298376, 418874, 573196, 837748, 1146392, 1675496, 2722681, 5445362, 10890724, 21781448]

約数ペア:

[(1, 21781448), (2, 10890724), (4, 5445362), (8, 2722681), (13, 1675496), (19, 1146392), (26, 837748), (38, 573196), (52, 418874), (73, 298376), (76, 286598), (104, 209437), (146, 149188), (151, 144248), (152, 143299), (247, 88184), (292, 74594), (302, 72124), (494, 44092), (584, 37297), (604, 36062), (949, 22952), (988, 22046), (1208, 18031), (1387, 15704), (1898, 11476), (1963, 11096), (1976, 11023), (2774, 7852), (2869, 7592), (3796, 5738), (3926, 5548)]