21989942

素因数分解:

$2^1\times {\mathrm{13}}^2\times {\mathrm{17}}^1\times {\mathrm{43}}^1\times {\mathrm{89}}^1$

素因数の和:177

約数の個数: 48

約数和(自身を含む): 39132720

約数和(自身を除く): 17142778

約数列:

[1, 2, 13, 17, 26, 34, 43, 86, 89, 169, 178, 221, 338, 442, 559, 731, 1118, 1157, 1462, 1513, 2314, 2873, 3026, 3827, 5746, 7267, 7654, 9503, 14534, 15041, 19006, 19669, 30082, 39338, 49751, 65059, 99502, 123539, 130118, 247078, 255697, 511394, 646763, 845767, 1293526, 1691534, 10994971, 21989942]

約数ペア:

[(1, 21989942), (2, 10994971), (13, 1691534), (17, 1293526), (26, 845767), (34, 646763), (43, 511394), (86, 255697), (89, 247078), (169, 130118), (178, 123539), (221, 99502), (338, 65059), (442, 49751), (559, 39338), (731, 30082), (1118, 19669), (1157, 19006), (1462, 15041), (1513, 14534), (2314, 9503), (2873, 7654), (3026, 7267), (3827, 5746)]