21960

素因数分解:

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

素因数の和:78

約数の個数: 48

約数和(自身を含む): 72540

約数和(自身を除く): 50580

約数列:

[1, 2, 3, 4, 5, 6, 8, 9, 10, 12, 15, 18, 20, 24, 30, 36, 40, 45, 60, 61, 72, 90, 120, 122, 180, 183, 244, 305, 360, 366, 488, 549, 610, 732, 915, 1098, 1220, 1464, 1830, 2196, 2440, 2745, 3660, 4392, 5490, 7320, 10980, 21960]

約数ペア:

[(1, 21960), (2, 10980), (3, 7320), (4, 5490), (5, 4392), (6, 3660), (8, 2745), (9, 2440), (10, 2196), (12, 1830), (15, 1464), (18, 1220), (20, 1098), (24, 915), (30, 732), (36, 610), (40, 549), (45, 488), (60, 366), (61, 360), (72, 305), (90, 244), (120, 183), (122, 180)]