21480784

素因数分解:

$2^4\times {\mathrm{13}}^1\times {\mathrm{61}}^1\times {\mathrm{1693}}^1$

素因数の和:1775

約数の個数: 40

約数和(自身を含む): 45582152

約数和(自身を除く): 24101368

約数列:

[1, 2, 4, 8, 13, 16, 26, 52, 61, 104, 122, 208, 244, 488, 793, 976, 1586, 1693, 3172, 3386, 6344, 6772, 12688, 13544, 22009, 27088, 44018, 88036, 103273, 176072, 206546, 352144, 413092, 826184, 1342549, 1652368, 2685098, 5370196, 10740392, 21480784]

約数ペア:

[(1, 21480784), (2, 10740392), (4, 5370196), (8, 2685098), (13, 1652368), (16, 1342549), (26, 826184), (52, 413092), (61, 352144), (104, 206546), (122, 176072), (208, 103273), (244, 88036), (488, 44018), (793, 27088), (976, 22009), (1586, 13544), (1693, 12688), (3172, 6772), (3386, 6344)]