18998575

素因数分解:

$5^2\times {\mathrm{19}}^1\times {\mathrm{23}}^1\times {\mathrm{37}}^1\times {\mathrm{47}}^1$

素因数の和:136

約数の個数: 48

約数和(自身を含む): 27141120

約数和(自身を除く): 8142545

約数列:

[1, 5, 19, 23, 25, 37, 47, 95, 115, 185, 235, 437, 475, 575, 703, 851, 893, 925, 1081, 1175, 1739, 2185, 3515, 4255, 4465, 5405, 8695, 10925, 16169, 17575, 20539, 21275, 22325, 27025, 33041, 39997, 43475, 80845, 102695, 165205, 199985, 404225, 513475, 759943, 826025, 999925, 3799715, 18998575]

約数ペア:

[(1, 18998575), (5, 3799715), (19, 999925), (23, 826025), (25, 759943), (37, 513475), (47, 404225), (95, 199985), (115, 165205), (185, 102695), (235, 80845), (437, 43475), (475, 39997), (575, 33041), (703, 27025), (851, 22325), (893, 21275), (925, 20539), (1081, 17575), (1175, 16169), (1739, 10925), (2185, 8695), (3515, 5405), (4255, 4465)]