21503505

素因数分解:

$3^1\times 5^1\times {\mathrm{23}}^1\times {\mathrm{157}}^1\times {\mathrm{397}}^1$

素因数の和:585

約数の個数: 32

約数和(自身を含む): 36221184

約数和(自身を除く): 14717679

約数列:

[1, 3, 5, 15, 23, 69, 115, 157, 345, 397, 471, 785, 1191, 1985, 2355, 3611, 5955, 9131, 10833, 18055, 27393, 45655, 54165, 62329, 136965, 186987, 311645, 934935, 1433567, 4300701, 7167835, 21503505]

約数ペア:

[(1, 21503505), (3, 7167835), (5, 4300701), (15, 1433567), (23, 934935), (69, 311645), (115, 186987), (157, 136965), (345, 62329), (397, 54165), (471, 45655), (785, 27393), (1191, 18055), (1985, 10833), (2355, 9131), (3611, 5955)]