19984060

素因数分解:

$2^2\times 5^1\times {\mathrm{89}}^1\times {\mathrm{103}}^1\times {\mathrm{109}}^1$

素因数の和:310

約数の個数: 48

約数和(自身を含む): 43243200

約数和(自身を除く): 23259140

約数列:

[1, 2, 4, 5, 10, 20, 89, 103, 109, 178, 206, 218, 356, 412, 436, 445, 515, 545, 890, 1030, 1090, 1780, 2060, 2180, 9167, 9701, 11227, 18334, 19402, 22454, 36668, 38804, 44908, 45835, 48505, 56135, 91670, 97010, 112270, 183340, 194020, 224540, 999203, 1998406, 3996812, 4996015, 9992030, 19984060]

約数ペア:

[(1, 19984060), (2, 9992030), (4, 4996015), (5, 3996812), (10, 1998406), (20, 999203), (89, 224540), (103, 194020), (109, 183340), (178, 112270), (206, 97010), (218, 91670), (356, 56135), (412, 48505), (436, 45835), (445, 44908), (515, 38804), (545, 36668), (890, 22454), (1030, 19402), (1090, 18334), (1780, 11227), (2060, 9701), (2180, 9167)]