19510240

素因数分解:

$2^5\times 5^1\times {\mathrm{61}}^1\times {\mathrm{1999}}^1$

素因数の和:2075

約数の個数: 48

約数和(自身を含む): 46872000

約数和(自身を除く): 27361760

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 61, 80, 122, 160, 244, 305, 488, 610, 976, 1220, 1952, 1999, 2440, 3998, 4880, 7996, 9760, 9995, 15992, 19990, 31984, 39980, 63968, 79960, 121939, 159920, 243878, 319840, 487756, 609695, 975512, 1219390, 1951024, 2438780, 3902048, 4877560, 9755120, 19510240]

約数ペア:

[(1, 19510240), (2, 9755120), (4, 4877560), (5, 3902048), (8, 2438780), (10, 1951024), (16, 1219390), (20, 975512), (32, 609695), (40, 487756), (61, 319840), (80, 243878), (122, 159920), (160, 121939), (244, 79960), (305, 63968), (488, 39980), (610, 31984), (976, 19990), (1220, 15992), (1952, 9995), (1999, 9760), (2440, 7996), (3998, 4880)]