21720015

素因数分解:

$3^3\times 5^1\times {\mathrm{349}}^1\times {\mathrm{461}}^1$

素因数の和:824

約数の個数: 32

約数和(自身を含む): 38808000

約数和(自身を除く): 17087985

約数列:

[1, 3, 5, 9, 15, 27, 45, 135, 349, 461, 1047, 1383, 1745, 2305, 3141, 4149, 5235, 6915, 9423, 12447, 15705, 20745, 47115, 62235, 160889, 482667, 804445, 1448001, 2413335, 4344003, 7240005, 21720015]

約数ペア:

[(1, 21720015), (3, 7240005), (5, 4344003), (9, 2413335), (15, 1448001), (27, 804445), (45, 482667), (135, 160889), (349, 62235), (461, 47115), (1047, 20745), (1383, 15705), (1745, 12447), (2305, 9423), (3141, 6915), (4149, 5235)]