21505245

素因数分解:

$3^1\times 5^1\times {\mathrm{19}}^1\times {\mathrm{61}}^1\times {\mathrm{1237}}^1$

素因数の和:1325

約数の個数: 32

約数和(自身を含む): 36842880

約数和(自身を除く): 15337635

約数列:

[1, 3, 5, 15, 19, 57, 61, 95, 183, 285, 305, 915, 1159, 1237, 3477, 3711, 5795, 6185, 17385, 18555, 23503, 70509, 75457, 117515, 226371, 352545, 377285, 1131855, 1433683, 4301049, 7168415, 21505245]

約数ペア:

[(1, 21505245), (3, 7168415), (5, 4301049), (15, 1433683), (19, 1131855), (57, 377285), (61, 352545), (95, 226371), (183, 117515), (285, 75457), (305, 70509), (915, 23503), (1159, 18555), (1237, 17385), (3477, 6185), (3711, 5795)]