21981232

素因数分解:

$2^4\times 7^1\times {\mathrm{13}}^1\times {\mathrm{31}}^1\times {\mathrm{487}}^1$

素因数の和:546

約数の個数: 80

約数和(自身を含む): 54218752

約数和(自身を除く): 32237520

約数列:

[1, 2, 4, 7, 8, 13, 14, 16, 26, 28, 31, 52, 56, 62, 91, 104, 112, 124, 182, 208, 217, 248, 364, 403, 434, 487, 496, 728, 806, 868, 974, 1456, 1612, 1736, 1948, 2821, 3224, 3409, 3472, 3896, 5642, 6331, 6448, 6818, 7792, 11284, 12662, 13636, 15097, 22568, 25324, 27272, 30194, 44317, 45136, 50648, 54544, 60388, 88634, 101296, 105679, 120776, 177268, 196261, 211358, 241552, 354536, 392522, 422716, 709072, 785044, 845432, 1373827, 1570088, 1690864, 2747654, 3140176, 5495308, 10990616, 21981232]

約数ペア:

[(1, 21981232), (2, 10990616), (4, 5495308), (7, 3140176), (8, 2747654), (13, 1690864), (14, 1570088), (16, 1373827), (26, 845432), (28, 785044), (31, 709072), (52, 422716), (56, 392522), (62, 354536), (91, 241552), (104, 211358), (112, 196261), (124, 177268), (182, 120776), (208, 105679), (217, 101296), (248, 88634), (364, 60388), (403, 54544), (434, 50648), (487, 45136), (496, 44317), (728, 30194), (806, 27272), (868, 25324), (974, 22568), (1456, 15097), (1612, 13636), (1736, 12662), (1948, 11284), (2821, 7792), (3224, 6818), (3409, 6448), (3472, 6331), (3896, 5642)]