20687980

素因数分解:

$2^2\times 5^1\times {\mathrm{17}}^1\times {\mathrm{71}}^1\times {\mathrm{857}}^1$

素因数の和:954

約数の個数: 48

約数和(自身を含む): 46702656

約数和(自身を除く): 26014676

約数列:

[1, 2, 4, 5, 10, 17, 20, 34, 68, 71, 85, 142, 170, 284, 340, 355, 710, 857, 1207, 1420, 1714, 2414, 3428, 4285, 4828, 6035, 8570, 12070, 14569, 17140, 24140, 29138, 58276, 60847, 72845, 121694, 145690, 243388, 291380, 304235, 608470, 1034399, 1216940, 2068798, 4137596, 5171995, 10343990, 20687980]

約数ペア:

[(1, 20687980), (2, 10343990), (4, 5171995), (5, 4137596), (10, 2068798), (17, 1216940), (20, 1034399), (34, 608470), (68, 304235), (71, 291380), (85, 243388), (142, 145690), (170, 121694), (284, 72845), (340, 60847), (355, 58276), (710, 29138), (857, 24140), (1207, 17140), (1420, 14569), (1714, 12070), (2414, 8570), (3428, 6035), (4285, 4828)]