20909420

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{233}}^1\times {\mathrm{641}}^1$

素因数の和:890

約数の個数: 48

約数和(自身を含む): 50476608

約数和(自身を除く): 29567188

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 140, 233, 466, 641, 932, 1165, 1282, 1631, 2330, 2564, 3205, 3262, 4487, 4660, 6410, 6524, 8155, 8974, 12820, 16310, 17948, 22435, 32620, 44870, 89740, 149353, 298706, 597412, 746765, 1045471, 1493530, 2090942, 2987060, 4181884, 5227355, 10454710, 20909420]

約数ペア:

[(1, 20909420), (2, 10454710), (4, 5227355), (5, 4181884), (7, 2987060), (10, 2090942), (14, 1493530), (20, 1045471), (28, 746765), (35, 597412), (70, 298706), (140, 149353), (233, 89740), (466, 44870), (641, 32620), (932, 22435), (1165, 17948), (1282, 16310), (1631, 12820), (2330, 8974), (2564, 8155), (3205, 6524), (3262, 6410), (4487, 4660)]