20820645

素因数分解:

$3^4\times 5^1\times {\mathrm{101}}^1\times {\mathrm{509}}^1$

素因数の和:627

約数の個数: 40

約数和(自身を含む): 37766520

約数和(自身を除く): 16945875

約数列:

[1, 3, 5, 9, 15, 27, 45, 81, 101, 135, 303, 405, 505, 509, 909, 1515, 1527, 2545, 2727, 4545, 4581, 7635, 8181, 13635, 13743, 22905, 40905, 41229, 51409, 68715, 154227, 206145, 257045, 462681, 771135, 1388043, 2313405, 4164129, 6940215, 20820645]

約数ペア:

[(1, 20820645), (3, 6940215), (5, 4164129), (9, 2313405), (15, 1388043), (27, 771135), (45, 462681), (81, 257045), (101, 206145), (135, 154227), (303, 68715), (405, 51409), (505, 41229), (509, 40905), (909, 22905), (1515, 13743), (1527, 13635), (2545, 8181), (2727, 7635), (4545, 4581)]