21195304

素因数分解:

$2^3\times {\mathrm{13}}^2\times {\mathrm{61}}^1\times {\mathrm{257}}^1$

素因数の和:350

約数の個数: 48

約数和(自身を含む): 43909020

約数和(自身を除く): 22713716

約数列:

[1, 2, 4, 8, 13, 26, 52, 61, 104, 122, 169, 244, 257, 338, 488, 514, 676, 793, 1028, 1352, 1586, 2056, 3172, 3341, 6344, 6682, 10309, 13364, 15677, 20618, 26728, 31354, 41236, 43433, 62708, 82472, 86866, 125416, 173732, 203801, 347464, 407602, 815204, 1630408, 2649413, 5298826, 10597652, 21195304]

約数ペア:

[(1, 21195304), (2, 10597652), (4, 5298826), (8, 2649413), (13, 1630408), (26, 815204), (52, 407602), (61, 347464), (104, 203801), (122, 173732), (169, 125416), (244, 86866), (257, 82472), (338, 62708), (488, 43433), (514, 41236), (676, 31354), (793, 26728), (1028, 20618), (1352, 15677), (1586, 13364), (2056, 10309), (3172, 6682), (3341, 6344)]