19812020

素因数分解:

$2^2\times 5^1\times {\mathrm{37}}^1\times {\mathrm{41}}^1\times {\mathrm{653}}^1$

素因数の和:740

約数の個数: 48

約数和(自身を含む): 43838928

約数和(自身を除く): 24026908

約数列:

[1, 2, 4, 5, 10, 20, 37, 41, 74, 82, 148, 164, 185, 205, 370, 410, 653, 740, 820, 1306, 1517, 2612, 3034, 3265, 6068, 6530, 7585, 13060, 15170, 24161, 26773, 30340, 48322, 53546, 96644, 107092, 120805, 133865, 241610, 267730, 483220, 535460, 990601, 1981202, 3962404, 4953005, 9906010, 19812020]

約数ペア:

[(1, 19812020), (2, 9906010), (4, 4953005), (5, 3962404), (10, 1981202), (20, 990601), (37, 535460), (41, 483220), (74, 267730), (82, 241610), (148, 133865), (164, 120805), (185, 107092), (205, 96644), (370, 53546), (410, 48322), (653, 30340), (740, 26773), (820, 24161), (1306, 15170), (1517, 13060), (2612, 7585), (3034, 6530), (3265, 6068)]