21371455

素因数分解:

$5^1\times 7^1\times {\mathrm{41}}^1\times {\mathrm{53}}^1\times {\mathrm{281}}^1$

素因数の和:387

約数の個数: 32

約数和(自身を含む): 30699648

約数和(自身を除く): 9328193

約数列:

[1, 5, 7, 35, 41, 53, 205, 265, 281, 287, 371, 1405, 1435, 1855, 1967, 2173, 9835, 10865, 11521, 14893, 15211, 57605, 74465, 76055, 80647, 104251, 403235, 521255, 610613, 3053065, 4274291, 21371455]

約数ペア:

[(1, 21371455), (5, 4274291), (7, 3053065), (35, 610613), (41, 521255), (53, 403235), (205, 104251), (265, 80647), (281, 76055), (287, 74465), (371, 57605), (1405, 15211), (1435, 14893), (1855, 11521), (1967, 10865), (2173, 9835)]