21289760

素因数分解:

$2^5\times 5^1\times {\mathrm{271}}^1\times {\mathrm{491}}^1$

素因数の和:777

約数の個数: 48

約数和(自身を含む): 50585472

約数和(自身を除く): 29295712

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 80, 160, 271, 491, 542, 982, 1084, 1355, 1964, 2168, 2455, 2710, 3928, 4336, 4910, 5420, 7856, 8672, 9820, 10840, 15712, 19640, 21680, 39280, 43360, 78560, 133061, 266122, 532244, 665305, 1064488, 1330610, 2128976, 2661220, 4257952, 5322440, 10644880, 21289760]

約数ペア:

[(1, 21289760), (2, 10644880), (4, 5322440), (5, 4257952), (8, 2661220), (10, 2128976), (16, 1330610), (20, 1064488), (32, 665305), (40, 532244), (80, 266122), (160, 133061), (271, 78560), (491, 43360), (542, 39280), (982, 21680), (1084, 19640), (1355, 15712), (1964, 10840), (2168, 9820), (2455, 8672), (2710, 7856), (3928, 5420), (4336, 4910)]