19995920

素因数分解:

$2^4\times 5^1\times 7^2\times {\mathrm{5101}}^1$

素因数の和:5128

約数の個数: 60

約数和(自身を含む): 54091404

約数和(自身を除く): 34095484

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 28, 35, 40, 49, 56, 70, 80, 98, 112, 140, 196, 245, 280, 392, 490, 560, 784, 980, 1960, 3920, 5101, 10202, 20404, 25505, 35707, 40808, 51010, 71414, 81616, 102020, 142828, 178535, 204040, 249949, 285656, 357070, 408080, 499898, 571312, 714140, 999796, 1249745, 1428280, 1999592, 2499490, 2856560, 3999184, 4998980, 9997960, 19995920]

約数ペア:

[(1, 19995920), (2, 9997960), (4, 4998980), (5, 3999184), (7, 2856560), (8, 2499490), (10, 1999592), (14, 1428280), (16, 1249745), (20, 999796), (28, 714140), (35, 571312), (40, 499898), (49, 408080), (56, 357070), (70, 285656), (80, 249949), (98, 204040), (112, 178535), (140, 142828), (196, 102020), (245, 81616), (280, 71414), (392, 51010), (490, 40808), (560, 35707), (784, 25505), (980, 20404), (1960, 10202), (3920, 5101)]