20821521

素因数分解:

$3^1\times 7^2\times {\mathrm{197}}^1\times {\mathrm{719}}^1$

素因数の和:933

約数の個数: 24

約数和(自身を含む): 32503680

約数和(自身を除く): 11682159

約数列:

[1, 3, 7, 21, 49, 147, 197, 591, 719, 1379, 2157, 4137, 5033, 9653, 15099, 28959, 35231, 105693, 141643, 424929, 991501, 2974503, 6940507, 20821521]

約数ペア:

[(1, 20821521), (3, 6940507), (7, 2974503), (21, 991501), (49, 424929), (147, 141643), (197, 105693), (591, 35231), (719, 28959), (1379, 15099), (2157, 9653), (4137, 5033)]