21661425

素因数分解:

$3^4\times 5^2\times {\mathrm{19}}^1\times {\mathrm{563}}^1$

素因数の和:604

約数の個数: 60

約数和(自身を含む): 42311280

約数和(自身を除く): 20649855

約数列:

[1, 3, 5, 9, 15, 19, 25, 27, 45, 57, 75, 81, 95, 135, 171, 225, 285, 405, 475, 513, 563, 675, 855, 1425, 1539, 1689, 2025, 2565, 2815, 4275, 5067, 7695, 8445, 10697, 12825, 14075, 15201, 25335, 32091, 38475, 42225, 45603, 53485, 76005, 96273, 126675, 160455, 228015, 267425, 288819, 380025, 481365, 802275, 866457, 1140075, 1444095, 2406825, 4332285, 7220475, 21661425]

約数ペア:

[(1, 21661425), (3, 7220475), (5, 4332285), (9, 2406825), (15, 1444095), (19, 1140075), (25, 866457), (27, 802275), (45, 481365), (57, 380025), (75, 288819), (81, 267425), (95, 228015), (135, 160455), (171, 126675), (225, 96273), (285, 76005), (405, 53485), (475, 45603), (513, 42225), (563, 38475), (675, 32091), (855, 25335), (1425, 15201), (1539, 14075), (1689, 12825), (2025, 10697), (2565, 8445), (2815, 7695), (4275, 5067)]