20801560

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{109}}^1\times {\mathrm{367}}^1$

素因数の和:500

約数の個数: 64

約数和(自身を含む): 51004800

約数和(自身を除く): 30203240

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 26, 40, 52, 65, 104, 109, 130, 218, 260, 367, 436, 520, 545, 734, 872, 1090, 1417, 1468, 1835, 2180, 2834, 2936, 3670, 4360, 4771, 5668, 7085, 7340, 9542, 11336, 14170, 14680, 19084, 23855, 28340, 38168, 40003, 47710, 56680, 80006, 95420, 160012, 190840, 200015, 320024, 400030, 520039, 800060, 1040078, 1600120, 2080156, 2600195, 4160312, 5200390, 10400780, 20801560]

約数ペア:

[(1, 20801560), (2, 10400780), (4, 5200390), (5, 4160312), (8, 2600195), (10, 2080156), (13, 1600120), (20, 1040078), (26, 800060), (40, 520039), (52, 400030), (65, 320024), (104, 200015), (109, 190840), (130, 160012), (218, 95420), (260, 80006), (367, 56680), (436, 47710), (520, 40003), (545, 38168), (734, 28340), (872, 23855), (1090, 19084), (1417, 14680), (1468, 14170), (1835, 11336), (2180, 9542), (2834, 7340), (2936, 7085), (3670, 5668), (4360, 4771)]