64607680

素因数分解:

$2^6\times 5^1\times {\mathrm{101}}^1\times {\mathrm{1999}}^1$

素因数の和:2117

約数の個数: 56

約数和(自身を含む): 155448000

約数和(自身を除く): 90840320

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 101, 160, 202, 320, 404, 505, 808, 1010, 1616, 1999, 2020, 3232, 3998, 4040, 6464, 7996, 8080, 9995, 15992, 16160, 19990, 31984, 32320, 39980, 63968, 79960, 127936, 159920, 201899, 319840, 403798, 639680, 807596, 1009495, 1615192, 2018990, 3230384, 4037980, 6460768, 8075960, 12921536, 16151920, 32303840, 64607680]

約数ペア:

[(1, 64607680), (2, 32303840), (4, 16151920), (5, 12921536), (8, 8075960), (10, 6460768), (16, 4037980), (20, 3230384), (32, 2018990), (40, 1615192), (64, 1009495), (80, 807596), (101, 639680), (160, 403798), (202, 319840), (320, 201899), (404, 159920), (505, 127936), (808, 79960), (1010, 63968), (1616, 39980), (1999, 32320), (2020, 31984), (3232, 19990), (3998, 16160), (4040, 15992), (6464, 9995), (7996, 8080)]