640256

素因数分解:

$2^8\times {\mathrm{41}}^1\times {\mathrm{61}}^1$

素因数の和:118

約数の個数: 36

約数和(自身を含む): 1330644

約数和(自身を除く): 690388

約数列:

[1, 2, 4, 8, 16, 32, 41, 61, 64, 82, 122, 128, 164, 244, 256, 328, 488, 656, 976, 1312, 1952, 2501, 2624, 3904, 5002, 5248, 7808, 10004, 10496, 15616, 20008, 40016, 80032, 160064, 320128, 640256]

約数ペア:

[(1, 640256), (2, 320128), (4, 160064), (8, 80032), (16, 40016), (32, 20008), (41, 15616), (61, 10496), (64, 10004), (82, 7808), (122, 5248), (128, 5002), (164, 3904), (244, 2624), (256, 2501), (328, 1952), (488, 1312), (656, 976)]