21087140

素因数分解:

$2^2\times 5^1\times {\mathrm{17}}^1\times {\mathrm{109}}^1\times {\mathrm{569}}^1$

素因数の和:704

約数の個数: 48

約数和(自身を含む): 47401200

約数和(自身を除く): 26314060

約数列:

[1, 2, 4, 5, 10, 17, 20, 34, 68, 85, 109, 170, 218, 340, 436, 545, 569, 1090, 1138, 1853, 2180, 2276, 2845, 3706, 5690, 7412, 9265, 9673, 11380, 18530, 19346, 37060, 38692, 48365, 62021, 96730, 124042, 193460, 248084, 310105, 620210, 1054357, 1240420, 2108714, 4217428, 5271785, 10543570, 21087140]

約数ペア:

[(1, 21087140), (2, 10543570), (4, 5271785), (5, 4217428), (10, 2108714), (17, 1240420), (20, 1054357), (34, 620210), (68, 310105), (85, 248084), (109, 193460), (170, 124042), (218, 96730), (340, 62021), (436, 48365), (545, 38692), (569, 37060), (1090, 19346), (1138, 18530), (1853, 11380), (2180, 9673), (2276, 9265), (2845, 7412), (3706, 5690)]