20561680

素因数分解:

$2^4\times 5^1\times {\mathrm{31}}^1\times {\mathrm{8291}}^1$

素因数の和:8335

約数の個数: 40

約数和(自身を含む): 49353984

約数和(自身を除く): 28792304

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 31, 40, 62, 80, 124, 155, 248, 310, 496, 620, 1240, 2480, 8291, 16582, 33164, 41455, 66328, 82910, 132656, 165820, 257021, 331640, 514042, 663280, 1028084, 1285105, 2056168, 2570210, 4112336, 5140420, 10280840, 20561680]

約数ペア:

[(1, 20561680), (2, 10280840), (4, 5140420), (5, 4112336), (8, 2570210), (10, 2056168), (16, 1285105), (20, 1028084), (31, 663280), (40, 514042), (62, 331640), (80, 257021), (124, 165820), (155, 132656), (248, 82910), (310, 66328), (496, 41455), (620, 33164), (1240, 16582), (2480, 8291)]