21247504

素因数分解:

$2^4\times {\mathrm{43}}^1\times {\mathrm{89}}^1\times {\mathrm{347}}^1$

素因数の和:487

約数の個数: 40

約数和(自身を含む): 42720480

約数和(自身を除く): 21472976

約数列:

[1, 2, 4, 8, 16, 43, 86, 89, 172, 178, 344, 347, 356, 688, 694, 712, 1388, 1424, 2776, 3827, 5552, 7654, 14921, 15308, 29842, 30616, 30883, 59684, 61232, 61766, 119368, 123532, 238736, 247064, 494128, 1327969, 2655938, 5311876, 10623752, 21247504]

約数ペア:

[(1, 21247504), (2, 10623752), (4, 5311876), (8, 2655938), (16, 1327969), (43, 494128), (86, 247064), (89, 238736), (172, 123532), (178, 119368), (344, 61766), (347, 61232), (356, 59684), (688, 30883), (694, 30616), (712, 29842), (1388, 15308), (1424, 14921), (2776, 7654), (3827, 5552)]