19990784

素因数分解:

$2^8\times {\mathrm{11}}^1\times {\mathrm{31}}^1\times {\mathrm{229}}^1$

素因数の和:287

約数の個数: 72

約数和(自身を含む): 45131520

約数和(自身を除く): 25140736

約数列:

[1, 2, 4, 8, 11, 16, 22, 31, 32, 44, 62, 64, 88, 124, 128, 176, 229, 248, 256, 341, 352, 458, 496, 682, 704, 916, 992, 1364, 1408, 1832, 1984, 2519, 2728, 2816, 3664, 3968, 5038, 5456, 7099, 7328, 7936, 10076, 10912, 14198, 14656, 20152, 21824, 28396, 29312, 40304, 43648, 56792, 58624, 78089, 80608, 87296, 113584, 156178, 161216, 227168, 312356, 322432, 454336, 624712, 644864, 908672, 1249424, 1817344, 2498848, 4997696, 9995392, 19990784]

約数ペア:

[(1, 19990784), (2, 9995392), (4, 4997696), (8, 2498848), (11, 1817344), (16, 1249424), (22, 908672), (31, 644864), (32, 624712), (44, 454336), (62, 322432), (64, 312356), (88, 227168), (124, 161216), (128, 156178), (176, 113584), (229, 87296), (248, 80608), (256, 78089), (341, 58624), (352, 56792), (458, 43648), (496, 40304), (682, 29312), (704, 28396), (916, 21824), (992, 20152), (1364, 14656), (1408, 14198), (1832, 10912), (1984, 10076), (2519, 7936), (2728, 7328), (2816, 7099), (3664, 5456), (3968, 5038)]