20405216

素因数分解:

$2^5\times {\mathrm{13}}^1\times {\mathrm{181}}^1\times {\mathrm{271}}^1$

素因数の和:475

約数の個数: 48

約数和(自身を含む): 43662528

約数和(自身を除く): 23257312

約数列:

[1, 2, 4, 8, 13, 16, 26, 32, 52, 104, 181, 208, 271, 362, 416, 542, 724, 1084, 1448, 2168, 2353, 2896, 3523, 4336, 4706, 5792, 7046, 8672, 9412, 14092, 18824, 28184, 37648, 49051, 56368, 75296, 98102, 112736, 196204, 392408, 637663, 784816, 1275326, 1569632, 2550652, 5101304, 10202608, 20405216]

約数ペア:

[(1, 20405216), (2, 10202608), (4, 5101304), (8, 2550652), (13, 1569632), (16, 1275326), (26, 784816), (32, 637663), (52, 392408), (104, 196204), (181, 112736), (208, 98102), (271, 75296), (362, 56368), (416, 49051), (542, 37648), (724, 28184), (1084, 18824), (1448, 14092), (2168, 9412), (2353, 8672), (2896, 7046), (3523, 5792), (4336, 4706)]