21180117

素因数分解:

$3^1\times 7^1\times {\mathrm{19}}^1\times {\mathrm{109}}^1\times {\mathrm{487}}^1$

素因数の和:625

約数の個数: 32

約数和(自身を含む): 34355200

約数和(自身を除く): 13175083

約数列:

[1, 3, 7, 19, 21, 57, 109, 133, 327, 399, 487, 763, 1461, 2071, 2289, 3409, 6213, 9253, 10227, 14497, 27759, 43491, 53083, 64771, 159249, 194313, 371581, 1008577, 1114743, 3025731, 7060039, 21180117]

約数ペア:

[(1, 21180117), (3, 7060039), (7, 3025731), (19, 1114743), (21, 1008577), (57, 371581), (109, 194313), (133, 159249), (327, 64771), (399, 53083), (487, 43491), (763, 27759), (1461, 14497), (2071, 10227), (2289, 9253), (3409, 6213)]