20451255

素因数分解:

$3^1\times 5^1\times {\mathrm{11}}^1\times {\mathrm{17}}^1\times {\mathrm{23}}^1\times {\mathrm{317}}^1$

素因数の和:376

約数の個数: 64

約数和(自身を含む): 39564288

約数和(自身を除く): 19113033

約数列:

[1, 3, 5, 11, 15, 17, 23, 33, 51, 55, 69, 85, 115, 165, 187, 253, 255, 317, 345, 391, 561, 759, 935, 951, 1173, 1265, 1585, 1955, 2805, 3487, 3795, 4301, 4755, 5389, 5865, 7291, 10461, 12903, 16167, 17435, 21505, 21873, 26945, 36455, 52305, 59279, 64515, 80201, 80835, 109365, 123947, 177837, 240603, 296395, 371841, 401005, 619735, 889185, 1203015, 1363417, 1859205, 4090251, 6817085, 20451255]

約数ペア:

[(1, 20451255), (3, 6817085), (5, 4090251), (11, 1859205), (15, 1363417), (17, 1203015), (23, 889185), (33, 619735), (51, 401005), (55, 371841), (69, 296395), (85, 240603), (115, 177837), (165, 123947), (187, 109365), (253, 80835), (255, 80201), (317, 64515), (345, 59279), (391, 52305), (561, 36455), (759, 26945), (935, 21873), (951, 21505), (1173, 17435), (1265, 16167), (1585, 12903), (1955, 10461), (2805, 7291), (3487, 5865), (3795, 5389), (4301, 4755)]