20781592

素因数分解:

$2^3\times {\mathrm{13}}^2\times {\mathrm{19}}^1\times {\mathrm{809}}^1$

素因数の和:860

約数の個数: 48

約数和(自身を含む): 44469000

約数和(自身を除く): 23687408

約数列:

[1, 2, 4, 8, 13, 19, 26, 38, 52, 76, 104, 152, 169, 247, 338, 494, 676, 809, 988, 1352, 1618, 1976, 3211, 3236, 6422, 6472, 10517, 12844, 15371, 21034, 25688, 30742, 42068, 61484, 84136, 122968, 136721, 199823, 273442, 399646, 546884, 799292, 1093768, 1598584, 2597699, 5195398, 10390796, 20781592]

約数ペア:

[(1, 20781592), (2, 10390796), (4, 5195398), (8, 2597699), (13, 1598584), (19, 1093768), (26, 799292), (38, 546884), (52, 399646), (76, 273442), (104, 199823), (152, 136721), (169, 122968), (247, 84136), (338, 61484), (494, 42068), (676, 30742), (809, 25688), (988, 21034), (1352, 15371), (1618, 12844), (1976, 10517), (3211, 6472), (3236, 6422)]