21290325

素因数分解:

$3^1\times 5^2\times 7^1\times {\mathrm{107}}^1\times {\mathrm{379}}^1$

素因数の和:506

約数の個数: 48

約数和(自身を含む): 40711680

約数和(自身を除く): 19421355

約数列:

[1, 3, 5, 7, 15, 21, 25, 35, 75, 105, 107, 175, 321, 379, 525, 535, 749, 1137, 1605, 1895, 2247, 2653, 2675, 3745, 5685, 7959, 8025, 9475, 11235, 13265, 18725, 28425, 39795, 40553, 56175, 66325, 121659, 198975, 202765, 283871, 608295, 851613, 1013825, 1419355, 3041475, 4258065, 7096775, 21290325]

約数ペア:

[(1, 21290325), (3, 7096775), (5, 4258065), (7, 3041475), (15, 1419355), (21, 1013825), (25, 851613), (35, 608295), (75, 283871), (105, 202765), (107, 198975), (175, 121659), (321, 66325), (379, 56175), (525, 40553), (535, 39795), (749, 28425), (1137, 18725), (1605, 13265), (1895, 11235), (2247, 9475), (2653, 8025), (2675, 7959), (3745, 5685)]