78783020

素因数分解:

$2^2\times 5^1\times {\mathrm{71}}^1\times {\mathrm{109}}^1\times {\mathrm{509}}^1$

素因数の和:698

約数の個数: 48

約数和(自身を含む): 169646400

約数和(自身を除く): 90863380

約数列:

[1, 2, 4, 5, 10, 20, 71, 109, 142, 218, 284, 355, 436, 509, 545, 710, 1018, 1090, 1420, 2036, 2180, 2545, 5090, 7739, 10180, 15478, 30956, 36139, 38695, 55481, 72278, 77390, 110962, 144556, 154780, 180695, 221924, 277405, 361390, 554810, 722780, 1109620, 3939151, 7878302, 15756604, 19695755, 39391510, 78783020]

約数ペア:

[(1, 78783020), (2, 39391510), (4, 19695755), (5, 15756604), (10, 7878302), (20, 3939151), (71, 1109620), (109, 722780), (142, 554810), (218, 361390), (284, 277405), (355, 221924), (436, 180695), (509, 154780), (545, 144556), (710, 110962), (1018, 77390), (1090, 72278), (1420, 55481), (2036, 38695), (2180, 36139), (2545, 30956), (5090, 15478), (7739, 10180)]