4000020

素因数分解:

$2^2\times 3^1\times 5^1\times {\mathrm{163}}^1\times {\mathrm{409}}^1$

素因数の和:584

約数の個数: 48

約数和(自身を含む): 11296320

約数和(自身を除く): 7296300

約数列:

[1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60, 163, 326, 409, 489, 652, 815, 818, 978, 1227, 1630, 1636, 1956, 2045, 2445, 2454, 3260, 4090, 4890, 4908, 6135, 8180, 9780, 12270, 24540, 66667, 133334, 200001, 266668, 333335, 400002, 666670, 800004, 1000005, 1333340, 2000010, 4000020]

約数ペア:

[(1, 4000020), (2, 2000010), (3, 1333340), (4, 1000005), (5, 800004), (6, 666670), (10, 400002), (12, 333335), (15, 266668), (20, 200001), (30, 133334), (60, 66667), (163, 24540), (326, 12270), (409, 9780), (489, 8180), (652, 6135), (815, 4908), (818, 4890), (978, 4090), (1227, 3260), (1630, 2454), (1636, 2445), (1956, 2045)]