81307420

素因数分解:

$2^2\times 5^1\times {\mathrm{31}}^1\times {\mathrm{199}}^1\times {\mathrm{659}}^1$

素因数の和:898

約数の個数: 48

約数和(自身を含む): 177408000

約数和(自身を除く): 96100580

約数列:

[1, 2, 4, 5, 10, 20, 31, 62, 124, 155, 199, 310, 398, 620, 659, 796, 995, 1318, 1990, 2636, 3295, 3980, 6169, 6590, 12338, 13180, 20429, 24676, 30845, 40858, 61690, 81716, 102145, 123380, 131141, 204290, 262282, 408580, 524564, 655705, 1311410, 2622820, 4065371, 8130742, 16261484, 20326855, 40653710, 81307420]

約数ペア:

[(1, 81307420), (2, 40653710), (4, 20326855), (5, 16261484), (10, 8130742), (20, 4065371), (31, 2622820), (62, 1311410), (124, 655705), (155, 524564), (199, 408580), (310, 262282), (398, 204290), (620, 131141), (659, 123380), (796, 102145), (995, 81716), (1318, 61690), (1990, 40858), (2636, 30845), (3295, 24676), (3980, 20429), (6169, 13180), (6590, 12338)]