21405428

素因数分解:

$2^2\times {\mathrm{11}}^1\times {\mathrm{53}}^1\times {\mathrm{67}}^1\times {\mathrm{137}}^1$

素因数の和:272

約数の個数: 48

約数和(自身を含む): 42565824

約数和(自身を除く): 21160396

約数列:

[1, 2, 4, 11, 22, 44, 53, 67, 106, 134, 137, 212, 268, 274, 548, 583, 737, 1166, 1474, 1507, 2332, 2948, 3014, 3551, 6028, 7102, 7261, 9179, 14204, 14522, 18358, 29044, 36716, 39061, 78122, 79871, 100969, 156244, 159742, 201938, 319484, 403876, 486487, 972974, 1945948, 5351357, 10702714, 21405428]

約数ペア:

[(1, 21405428), (2, 10702714), (4, 5351357), (11, 1945948), (22, 972974), (44, 486487), (53, 403876), (67, 319484), (106, 201938), (134, 159742), (137, 156244), (212, 100969), (268, 79871), (274, 78122), (548, 39061), (583, 36716), (737, 29044), (1166, 18358), (1474, 14522), (1507, 14204), (2332, 9179), (2948, 7261), (3014, 7102), (3551, 6028)]