19710140

素因数分解:

$2^2\times 5^1\times {\mathrm{17}}^1\times {\mathrm{29}}^1\times {\mathrm{1999}}^1$

素因数の和:2054

約数の個数: 48

約数和(自身を含む): 45360000

約数和(自身を除く): 25649860

約数列:

[1, 2, 4, 5, 10, 17, 20, 29, 34, 58, 68, 85, 116, 145, 170, 290, 340, 493, 580, 986, 1972, 1999, 2465, 3998, 4930, 7996, 9860, 9995, 19990, 33983, 39980, 57971, 67966, 115942, 135932, 169915, 231884, 289855, 339830, 579710, 679660, 985507, 1159420, 1971014, 3942028, 4927535, 9855070, 19710140]

約数ペア:

[(1, 19710140), (2, 9855070), (4, 4927535), (5, 3942028), (10, 1971014), (17, 1159420), (20, 985507), (29, 679660), (34, 579710), (58, 339830), (68, 289855), (85, 231884), (116, 169915), (145, 135932), (170, 115942), (290, 67966), (340, 57971), (493, 39980), (580, 33983), (986, 19990), (1972, 9995), (1999, 9860), (2465, 7996), (3998, 4930)]