21505010

素因数分解:

$2^1\times 5^1\times {\mathrm{31}}^1\times {\mathrm{69371}}^1$

素因数の和:69409

約数の個数: 16

約数和(自身を含む): 39958272

約数和(自身を除く): 18453262

約数列:

[1, 2, 5, 10, 31, 62, 155, 310, 69371, 138742, 346855, 693710, 2150501, 4301002, 10752505, 21505010]

約数ペア:

[(1, 21505010), (2, 10752505), (5, 4301002), (10, 2150501), (31, 693710), (62, 346855), (155, 138742), (310, 69371)]