19729905

素因数分解:

$3^1\times 5^1\times {\mathrm{13}}^2\times {\mathrm{43}}^1\times {\mathrm{181}}^1$

素因数の和:258

約数の個数: 48

約数和(自身を含む): 35171136

約数和(自身を除く): 15441231

約数列:

[1, 3, 5, 13, 15, 39, 43, 65, 129, 169, 181, 195, 215, 507, 543, 559, 645, 845, 905, 1677, 2353, 2535, 2715, 2795, 7059, 7267, 7783, 8385, 11765, 21801, 23349, 30589, 35295, 36335, 38915, 91767, 101179, 109005, 116745, 152945, 303537, 458835, 505895, 1315327, 1517685, 3945981, 6576635, 19729905]

約数ペア:

[(1, 19729905), (3, 6576635), (5, 3945981), (13, 1517685), (15, 1315327), (39, 505895), (43, 458835), (65, 303537), (129, 152945), (169, 116745), (181, 109005), (195, 101179), (215, 91767), (507, 38915), (543, 36335), (559, 35295), (645, 30589), (845, 23349), (905, 21801), (1677, 11765), (2353, 8385), (2535, 7783), (2715, 7267), (2795, 7059)]