21421980

素因数分解:

$2^2\times 3^2\times 5^1\times {\mathrm{61}}^1\times {\mathrm{1951}}^1$

素因数の和:2027

約数の個数: 72

約数和(自身を含む): 66079104

約数和(自身を除く): 44657124

約数列:

[1, 2, 3, 4, 5, 6, 9, 10, 12, 15, 18, 20, 30, 36, 45, 60, 61, 90, 122, 180, 183, 244, 305, 366, 549, 610, 732, 915, 1098, 1220, 1830, 1951, 2196, 2745, 3660, 3902, 5490, 5853, 7804, 9755, 10980, 11706, 17559, 19510, 23412, 29265, 35118, 39020, 58530, 70236, 87795, 117060, 119011, 175590, 238022, 351180, 357033, 476044, 595055, 714066, 1071099, 1190110, 1428132, 1785165, 2142198, 2380220, 3570330, 4284396, 5355495, 7140660, 10710990, 21421980]

約数ペア:

[(1, 21421980), (2, 10710990), (3, 7140660), (4, 5355495), (5, 4284396), (6, 3570330), (9, 2380220), (10, 2142198), (12, 1785165), (15, 1428132), (18, 1190110), (20, 1071099), (30, 714066), (36, 595055), (45, 476044), (60, 357033), (61, 351180), (90, 238022), (122, 175590), (180, 119011), (183, 117060), (244, 87795), (305, 70236), (366, 58530), (549, 39020), (610, 35118), (732, 29265), (915, 23412), (1098, 19510), (1220, 17559), (1830, 11706), (1951, 10980), (2196, 9755), (2745, 7804), (3660, 5853), (3902, 5490)]