21153555

素因数分解:

$3^4\times 5^1\times {\mathrm{19}}^1\times {\mathrm{2749}}^1$

素因数の和:2785

約数の個数: 40

約数和(自身を含む): 39930000

約数和(自身を除く): 18776445

約数列:

[1, 3, 5, 9, 15, 19, 27, 45, 57, 81, 95, 135, 171, 285, 405, 513, 855, 1539, 2565, 2749, 7695, 8247, 13745, 24741, 41235, 52231, 74223, 123705, 156693, 222669, 261155, 371115, 470079, 783465, 1113345, 1410237, 2350395, 4230711, 7051185, 21153555]

約数ペア:

[(1, 21153555), (3, 7051185), (5, 4230711), (9, 2350395), (15, 1410237), (19, 1113345), (27, 783465), (45, 470079), (57, 371115), (81, 261155), (95, 222669), (135, 156693), (171, 123705), (285, 74223), (405, 52231), (513, 41235), (855, 24741), (1539, 13745), (2565, 8247), (2749, 7695)]