21003178

素因数分解:

$2^1\times 7^1\times {\mathrm{43}}^1\times {\mathrm{139}}^1\times {\mathrm{251}}^1$

素因数の和:442

約数の個数: 32

約数和(自身を含む): 37255680

約数和(自身を除く): 16252502

約数列:

[1, 2, 7, 14, 43, 86, 139, 251, 278, 301, 502, 602, 973, 1757, 1946, 3514, 5977, 10793, 11954, 21586, 34889, 41839, 69778, 75551, 83678, 151102, 244223, 488446, 1500227, 3000454, 10501589, 21003178]

約数ペア:

[(1, 21003178), (2, 10501589), (7, 3000454), (14, 1500227), (43, 488446), (86, 244223), (139, 151102), (251, 83678), (278, 75551), (301, 69778), (502, 41839), (602, 34889), (973, 21586), (1757, 11954), (1946, 10793), (3514, 5977)]