21787860

素因数分解:

$2^2\times 3^1\times 5^1\times {\mathrm{211}}^1\times {\mathrm{1721}}^1$

素因数の和:1944

約数の個数: 48

約数和(自身を含む): 61330752

約数和(自身を除く): 39542892

約数列:

[1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60, 211, 422, 633, 844, 1055, 1266, 1721, 2110, 2532, 3165, 3442, 4220, 5163, 6330, 6884, 8605, 10326, 12660, 17210, 20652, 25815, 34420, 51630, 103260, 363131, 726262, 1089393, 1452524, 1815655, 2178786, 3631310, 4357572, 5446965, 7262620, 10893930, 21787860]

約数ペア:

[(1, 21787860), (2, 10893930), (3, 7262620), (4, 5446965), (5, 4357572), (6, 3631310), (10, 2178786), (12, 1815655), (15, 1452524), (20, 1089393), (30, 726262), (60, 363131), (211, 103260), (422, 51630), (633, 34420), (844, 25815), (1055, 20652), (1266, 17210), (1721, 12660), (2110, 10326), (2532, 8605), (3165, 6884), (3442, 6330), (4220, 5163)]