641920280

素因数分解:

$2^3\times 5^1\times {\mathrm{16048007}}^1$

素因数の和:16048018

約数の個数: 16

約数和(自身を含む): 1444320720

約数和(自身を除く): 802400440

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 16048007, 32096014, 64192028, 80240035, 128384056, 160480070, 320960140, 641920280]

約数ペア:

[(1, 641920280), (2, 320960140), (4, 160480070), (5, 128384056), (8, 80240035), (10, 64192028), (20, 32096014), (40, 16048007)]