21289671

素因数分解:

$3^2\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{61}}^1\times {\mathrm{157}}^1$

素因数の和:256

約数の個数: 48

約数和(自身を含む): 35657440

約数和(自身を除く): 14367769

約数列:

[1, 3, 9, 13, 19, 39, 57, 61, 117, 157, 171, 183, 247, 471, 549, 741, 793, 1159, 1413, 2041, 2223, 2379, 2983, 3477, 6123, 7137, 8949, 9577, 10431, 15067, 18369, 26847, 28731, 38779, 45201, 86193, 116337, 124501, 135603, 181963, 349011, 373503, 545889, 1120509, 1637667, 2365519, 7096557, 21289671]

約数ペア:

[(1, 21289671), (3, 7096557), (9, 2365519), (13, 1637667), (19, 1120509), (39, 545889), (57, 373503), (61, 349011), (117, 181963), (157, 135603), (171, 124501), (183, 116337), (247, 86193), (471, 45201), (549, 38779), (741, 28731), (793, 26847), (1159, 18369), (1413, 15067), (2041, 10431), (2223, 9577), (2379, 8949), (2983, 7137), (3477, 6123)]