21519875

素因数分解:

$5^3\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{19}}^1\times {\mathrm{41}}^1$

素因数の和:105

約数の個数: 64

約数和(自身を含む): 33022080

約数和(自身を除く): 11502205

約数列:

[1, 5, 13, 17, 19, 25, 41, 65, 85, 95, 125, 205, 221, 247, 323, 325, 425, 475, 533, 697, 779, 1025, 1105, 1235, 1615, 1625, 2125, 2375, 2665, 3485, 3895, 4199, 5125, 5525, 6175, 8075, 9061, 10127, 13243, 13325, 17425, 19475, 20995, 27625, 30875, 40375, 45305, 50635, 66215, 66625, 87125, 97375, 104975, 172159, 226525, 253175, 331075, 524875, 860795, 1132625, 1265875, 1655375, 4303975, 21519875]

約数ペア:

[(1, 21519875), (5, 4303975), (13, 1655375), (17, 1265875), (19, 1132625), (25, 860795), (41, 524875), (65, 331075), (85, 253175), (95, 226525), (125, 172159), (205, 104975), (221, 97375), (247, 87125), (323, 66625), (325, 66215), (425, 50635), (475, 45305), (533, 40375), (697, 30875), (779, 27625), (1025, 20995), (1105, 19475), (1235, 17425), (1615, 13325), (1625, 13243), (2125, 10127), (2375, 9061), (2665, 8075), (3485, 6175), (3895, 5525), (4199, 5125)]