21039720

素因数分解:

$2^3\times 3^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{13487}}^1$

素因数の和:13514

約数の個数: 64

約数和(自身を含む): 67979520

約数和(自身を除く): 46939800

約数列:

[1, 2, 3, 4, 5, 6, 8, 10, 12, 13, 15, 20, 24, 26, 30, 39, 40, 52, 60, 65, 78, 104, 120, 130, 156, 195, 260, 312, 390, 520, 780, 1560, 13487, 26974, 40461, 53948, 67435, 80922, 107896, 134870, 161844, 175331, 202305, 269740, 323688, 350662, 404610, 525993, 539480, 701324, 809220, 876655, 1051986, 1402648, 1618440, 1753310, 2103972, 2629965, 3506620, 4207944, 5259930, 7013240, 10519860, 21039720]

約数ペア:

[(1, 21039720), (2, 10519860), (3, 7013240), (4, 5259930), (5, 4207944), (6, 3506620), (8, 2629965), (10, 2103972), (12, 1753310), (13, 1618440), (15, 1402648), (20, 1051986), (24, 876655), (26, 809220), (30, 701324), (39, 539480), (40, 525993), (52, 404610), (60, 350662), (65, 323688), (78, 269740), (104, 202305), (120, 175331), (130, 161844), (156, 134870), (195, 107896), (260, 80922), (312, 67435), (390, 53948), (520, 40461), (780, 26974), (1560, 13487)]