20905780

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{31}}^1\times {\mathrm{4817}}^1$

素因数の和:4864

約数の個数: 48

約数和(自身を含む): 51803136

約数和(自身を除く): 30897356

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 31, 35, 62, 70, 124, 140, 155, 217, 310, 434, 620, 868, 1085, 2170, 4340, 4817, 9634, 19268, 24085, 33719, 48170, 67438, 96340, 134876, 149327, 168595, 298654, 337190, 597308, 674380, 746635, 1045289, 1493270, 2090578, 2986540, 4181156, 5226445, 10452890, 20905780]

約数ペア:

[(1, 20905780), (2, 10452890), (4, 5226445), (5, 4181156), (7, 2986540), (10, 2090578), (14, 1493270), (20, 1045289), (28, 746635), (31, 674380), (35, 597308), (62, 337190), (70, 298654), (124, 168595), (140, 149327), (155, 134876), (217, 96340), (310, 67438), (434, 48170), (620, 33719), (868, 24085), (1085, 19268), (2170, 9634), (4340, 4817)]