400640

素因数分解:

$2^8\times 5^1\times {\mathrm{313}}^1$

素因数の和:334

約数の個数: 36

約数和(自身を含む): 962724

約数和(自身を除く): 562084

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 256, 313, 320, 626, 640, 1252, 1280, 1565, 2504, 3130, 5008, 6260, 10016, 12520, 20032, 25040, 40064, 50080, 80128, 100160, 200320, 400640]

約数ペア:

[(1, 400640), (2, 200320), (4, 100160), (5, 80128), (8, 50080), (10, 40064), (16, 25040), (20, 20032), (32, 12520), (40, 10016), (64, 6260), (80, 5008), (128, 3130), (160, 2504), (256, 1565), (313, 1280), (320, 1252), (626, 640)]