21181420

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{41}}^1\times {\mathrm{1987}}^1$

素因数の和:2050

約数の個数: 48

約数和(自身を含む): 49095648

約数和(自身を除く): 27914228

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 41, 52, 65, 82, 130, 164, 205, 260, 410, 533, 820, 1066, 1987, 2132, 2665, 3974, 5330, 7948, 9935, 10660, 19870, 25831, 39740, 51662, 81467, 103324, 129155, 162934, 258310, 325868, 407335, 516620, 814670, 1059071, 1629340, 2118142, 4236284, 5295355, 10590710, 21181420]

約数ペア:

[(1, 21181420), (2, 10590710), (4, 5295355), (5, 4236284), (10, 2118142), (13, 1629340), (20, 1059071), (26, 814670), (41, 516620), (52, 407335), (65, 325868), (82, 258310), (130, 162934), (164, 129155), (205, 103324), (260, 81467), (410, 51662), (533, 39740), (820, 25831), (1066, 19870), (1987, 10660), (2132, 9935), (2665, 7948), (3974, 5330)]