20215460

素因数分解:

$2^2\times 5^1\times {\mathrm{41}}^1\times {\mathrm{89}}^1\times {\mathrm{277}}^1$

素因数の和:416

約数の個数: 48

約数和(自身を含む): 44135280

約数和(自身を除く): 23919820

約数列:

[1, 2, 4, 5, 10, 20, 41, 82, 89, 164, 178, 205, 277, 356, 410, 445, 554, 820, 890, 1108, 1385, 1780, 2770, 3649, 5540, 7298, 11357, 14596, 18245, 22714, 24653, 36490, 45428, 49306, 56785, 72980, 98612, 113570, 123265, 227140, 246530, 493060, 1010773, 2021546, 4043092, 5053865, 10107730, 20215460]

約数ペア:

[(1, 20215460), (2, 10107730), (4, 5053865), (5, 4043092), (10, 2021546), (20, 1010773), (41, 493060), (82, 246530), (89, 227140), (164, 123265), (178, 113570), (205, 98612), (277, 72980), (356, 56785), (410, 49306), (445, 45428), (554, 36490), (820, 24653), (890, 22714), (1108, 18245), (1385, 14596), (1780, 11357), (2770, 7298), (3649, 5540)]