20421440

素因数分解:

$2^6\times 5^1\times {\mathrm{13}}^1\times {\mathrm{4909}}^1$

素因数の和:4939

約数の個数: 56

約数和(自身を含む): 52379880

約数和(自身を除く): 31958440

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 32, 40, 52, 64, 65, 80, 104, 130, 160, 208, 260, 320, 416, 520, 832, 1040, 2080, 4160, 4909, 9818, 19636, 24545, 39272, 49090, 63817, 78544, 98180, 127634, 157088, 196360, 255268, 314176, 319085, 392720, 510536, 638170, 785440, 1021072, 1276340, 1570880, 2042144, 2552680, 4084288, 5105360, 10210720, 20421440]

約数ペア:

[(1, 20421440), (2, 10210720), (4, 5105360), (5, 4084288), (8, 2552680), (10, 2042144), (13, 1570880), (16, 1276340), (20, 1021072), (26, 785440), (32, 638170), (40, 510536), (52, 392720), (64, 319085), (65, 314176), (80, 255268), (104, 196360), (130, 157088), (160, 127634), (208, 98180), (260, 78544), (320, 63817), (416, 49090), (520, 39272), (832, 24545), (1040, 19636), (2080, 9818), (4160, 4909)]