21820645

素因数分解:

$5^1\times 7^1\times {\mathrm{11}}^1\times {\mathrm{19}}^2\times {\mathrm{157}}^1$

素因数の和:218

約数の個数: 48

約数和(自身を含む): 34674048

約数和(自身を除く): 12853403

約数列:

[1, 5, 7, 11, 19, 35, 55, 77, 95, 133, 157, 209, 361, 385, 665, 785, 1045, 1099, 1463, 1727, 1805, 2527, 2983, 3971, 5495, 7315, 8635, 12089, 12635, 14915, 19855, 20881, 27797, 32813, 56677, 60445, 104405, 138985, 164065, 229691, 283385, 396739, 623447, 1148455, 1983695, 3117235, 4364129, 21820645]

約数ペア:

[(1, 21820645), (5, 4364129), (7, 3117235), (11, 1983695), (19, 1148455), (35, 623447), (55, 396739), (77, 283385), (95, 229691), (133, 164065), (157, 138985), (209, 104405), (361, 60445), (385, 56677), (665, 32813), (785, 27797), (1045, 20881), (1099, 19855), (1463, 14915), (1727, 12635), (1805, 12089), (2527, 8635), (2983, 7315), (3971, 5495)]