19979440

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{19211}}^1$

素因数の和:19237

約数の個数: 40

約数和(自身を含む): 50028048

約数和(自身を除く): 30048608

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 65, 80, 104, 130, 208, 260, 520, 1040, 19211, 38422, 76844, 96055, 153688, 192110, 249743, 307376, 384220, 499486, 768440, 998972, 1248715, 1536880, 1997944, 2497430, 3995888, 4994860, 9989720, 19979440]

約数ペア:

[(1, 19979440), (2, 9989720), (4, 4994860), (5, 3995888), (8, 2497430), (10, 1997944), (13, 1536880), (16, 1248715), (20, 998972), (26, 768440), (40, 499486), (52, 384220), (65, 307376), (80, 249743), (104, 192110), (130, 153688), (208, 96055), (260, 76844), (520, 38422), (1040, 19211)]