21871928

素因数分解:

$2^3\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{89}}^1\times {\mathrm{139}}^1$

素因数の和:264

約数の個数: 64

約数和(自身を含む): 47628000

約数和(自身を除く): 25756072

約数列:

[1, 2, 4, 8, 13, 17, 26, 34, 52, 68, 89, 104, 136, 139, 178, 221, 278, 356, 442, 556, 712, 884, 1112, 1157, 1513, 1768, 1807, 2314, 2363, 3026, 3614, 4628, 4726, 6052, 7228, 9256, 9452, 12104, 12371, 14456, 18904, 19669, 24742, 30719, 39338, 49484, 61438, 78676, 98968, 122876, 157352, 160823, 210307, 245752, 321646, 420614, 643292, 841228, 1286584, 1682456, 2733991, 5467982, 10935964, 21871928]

約数ペア:

[(1, 21871928), (2, 10935964), (4, 5467982), (8, 2733991), (13, 1682456), (17, 1286584), (26, 841228), (34, 643292), (52, 420614), (68, 321646), (89, 245752), (104, 210307), (136, 160823), (139, 157352), (178, 122876), (221, 98968), (278, 78676), (356, 61438), (442, 49484), (556, 39338), (712, 30719), (884, 24742), (1112, 19669), (1157, 18904), (1513, 14456), (1768, 12371), (1807, 12104), (2314, 9452), (2363, 9256), (3026, 7228), (3614, 6052), (4628, 4726)]