18989984

素因数分解:

$2^5\times {\mathrm{13}}^1\times {\mathrm{191}}^1\times {\mathrm{239}}^1$

素因数の和:453

約数の個数: 48

約数和(自身を含む): 40642560

約数和(自身を除く): 21652576

約数列:

[1, 2, 4, 8, 13, 16, 26, 32, 52, 104, 191, 208, 239, 382, 416, 478, 764, 956, 1528, 1912, 2483, 3056, 3107, 3824, 4966, 6112, 6214, 7648, 9932, 12428, 19864, 24856, 39728, 45649, 49712, 79456, 91298, 99424, 182596, 365192, 593437, 730384, 1186874, 1460768, 2373748, 4747496, 9494992, 18989984]

約数ペア:

[(1, 18989984), (2, 9494992), (4, 4747496), (8, 2373748), (13, 1460768), (16, 1186874), (26, 730384), (32, 593437), (52, 365192), (104, 182596), (191, 99424), (208, 91298), (239, 79456), (382, 49712), (416, 45649), (478, 39728), (764, 24856), (956, 19864), (1528, 12428), (1912, 9932), (2483, 7648), (3056, 6214), (3107, 6112), (3824, 4966)]