20719940

素因数分解:

$2^2\times 5^1\times {\mathrm{17}}^1\times {\mathrm{149}}^1\times {\mathrm{409}}^1$

素因数の和:584

約数の個数: 48

約数和(自身を含む): 46494000

約数和(自身を除く): 25774060

約数列:

[1, 2, 4, 5, 10, 17, 20, 34, 68, 85, 149, 170, 298, 340, 409, 596, 745, 818, 1490, 1636, 2045, 2533, 2980, 4090, 5066, 6953, 8180, 10132, 12665, 13906, 25330, 27812, 34765, 50660, 60941, 69530, 121882, 139060, 243764, 304705, 609410, 1035997, 1218820, 2071994, 4143988, 5179985, 10359970, 20719940]

約数ペア:

[(1, 20719940), (2, 10359970), (4, 5179985), (5, 4143988), (10, 2071994), (17, 1218820), (20, 1035997), (34, 609410), (68, 304705), (85, 243764), (149, 139060), (170, 121882), (298, 69530), (340, 60941), (409, 50660), (596, 34765), (745, 27812), (818, 25330), (1490, 13906), (1636, 12665), (2045, 10132), (2533, 8180), (2980, 6953), (4090, 5066)]