21256816

素因数分解:

$2^4\times 7^1\times {\mathrm{53}}^1\times {\mathrm{3581}}^1$

素因数の和:3649

約数の個数: 40

約数和(自身を含む): 47970144

約数和(自身を除く): 26713328

約数列:

[1, 2, 4, 7, 8, 14, 16, 28, 53, 56, 106, 112, 212, 371, 424, 742, 848, 1484, 2968, 3581, 5936, 7162, 14324, 25067, 28648, 50134, 57296, 100268, 189793, 200536, 379586, 401072, 759172, 1328551, 1518344, 2657102, 3036688, 5314204, 10628408, 21256816]

約数ペア:

[(1, 21256816), (2, 10628408), (4, 5314204), (7, 3036688), (8, 2657102), (14, 1518344), (16, 1328551), (28, 759172), (53, 401072), (56, 379586), (106, 200536), (112, 189793), (212, 100268), (371, 57296), (424, 50134), (742, 28648), (848, 25067), (1484, 14324), (2968, 7162), (3581, 5936)]