21519820

素因数分解:

$2^2\times 5^1\times 7^3\times {\mathrm{3137}}^1$

素因数の和:3167

約数の個数: 48

約数和(自身を含む): 52718400

約数和(自身を除く): 31198580

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 49, 70, 98, 140, 196, 245, 343, 490, 686, 980, 1372, 1715, 3137, 3430, 6274, 6860, 12548, 15685, 21959, 31370, 43918, 62740, 87836, 109795, 153713, 219590, 307426, 439180, 614852, 768565, 1075991, 1537130, 2151982, 3074260, 4303964, 5379955, 10759910, 21519820]

約数ペア:

[(1, 21519820), (2, 10759910), (4, 5379955), (5, 4303964), (7, 3074260), (10, 2151982), (14, 1537130), (20, 1075991), (28, 768565), (35, 614852), (49, 439180), (70, 307426), (98, 219590), (140, 153713), (196, 109795), (245, 87836), (343, 62740), (490, 43918), (686, 31370), (980, 21959), (1372, 15685), (1715, 12548), (3137, 6860), (3430, 6274)]