645820

素因数分解:

$2^2\times 5^1\times 7^2\times {\mathrm{659}}^1$

素因数の和:682

約数の個数: 36

約数和(自身を含む): 1580040

約数和(自身を除く): 934220

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 49, 70, 98, 140, 196, 245, 490, 659, 980, 1318, 2636, 3295, 4613, 6590, 9226, 13180, 18452, 23065, 32291, 46130, 64582, 92260, 129164, 161455, 322910, 645820]

約数ペア:

[(1, 645820), (2, 322910), (4, 161455), (5, 129164), (7, 92260), (10, 64582), (14, 46130), (20, 32291), (28, 23065), (35, 18452), (49, 13180), (70, 9226), (98, 6590), (140, 4613), (196, 3295), (245, 2636), (490, 1318), (659, 980)]