18947960

素因数分解:

$2^3\times 5^1\times {\mathrm{641}}^1\times {\mathrm{739}}^1$

素因数の和:1391

約数の個数: 32

約数和(自身を含む): 42757200

約数和(自身を除く): 23809240

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 641, 739, 1282, 1478, 2564, 2956, 3205, 3695, 5128, 5912, 6410, 7390, 12820, 14780, 25640, 29560, 473699, 947398, 1894796, 2368495, 3789592, 4736990, 9473980, 18947960]

約数ペア:

[(1, 18947960), (2, 9473980), (4, 4736990), (5, 3789592), (8, 2368495), (10, 1894796), (20, 947398), (40, 473699), (641, 29560), (739, 25640), (1282, 14780), (1478, 12820), (2564, 7390), (2956, 6410), (3205, 5912), (3695, 5128)]