405408020

素因数分解:

$2^2\times 5^1\times {\mathrm{107}}^1\times {\mathrm{389}}^1\times {\mathrm{487}}^1$

素因数の和:992

約数の個数: 48

約数和(自身を含む): 863291520

約数和(自身を除く): 457883500

約数列:

[1, 2, 4, 5, 10, 20, 107, 214, 389, 428, 487, 535, 778, 974, 1070, 1556, 1945, 1948, 2140, 2435, 3890, 4870, 7780, 9740, 41623, 52109, 83246, 104218, 166492, 189443, 208115, 208436, 260545, 378886, 416230, 521090, 757772, 832460, 947215, 1042180, 1894430, 3788860, 20270401, 40540802, 81081604, 101352005, 202704010, 405408020]

約数ペア:

[(1, 405408020), (2, 202704010), (4, 101352005), (5, 81081604), (10, 40540802), (20, 20270401), (107, 3788860), (214, 1894430), (389, 1042180), (428, 947215), (487, 832460), (535, 757772), (778, 521090), (974, 416230), (1070, 378886), (1556, 260545), (1945, 208436), (1948, 208115), (2140, 189443), (2435, 166492), (3890, 104218), (4870, 83246), (7780, 52109), (9740, 41623)]