20921780

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{61}}^1\times {\mathrm{1559}}^1$

素因数の和:1640

約数の個数: 48

約数和(自身を含む): 48746880

約数和(自身を除く): 27825100

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 44, 55, 61, 110, 122, 220, 244, 305, 610, 671, 1220, 1342, 1559, 2684, 3118, 3355, 6236, 6710, 7795, 13420, 15590, 17149, 31180, 34298, 68596, 85745, 95099, 171490, 190198, 342980, 380396, 475495, 950990, 1046089, 1901980, 2092178, 4184356, 5230445, 10460890, 20921780]

約数ペア:

[(1, 20921780), (2, 10460890), (4, 5230445), (5, 4184356), (10, 2092178), (11, 1901980), (20, 1046089), (22, 950990), (44, 475495), (55, 380396), (61, 342980), (110, 190198), (122, 171490), (220, 95099), (244, 85745), (305, 68596), (610, 34298), (671, 31180), (1220, 17149), (1342, 15590), (1559, 13420), (2684, 7795), (3118, 6710), (3355, 6236)]