20210215

素因数分解:

$5^1\times {\mathrm{23}}^1\times {\mathrm{43}}^1\times {\mathrm{61}}^1\times {\mathrm{67}}^1$

素因数の和:199

約数の個数: 32

約数和(自身を含む): 26712576

約数和(自身を除く): 6502361

約数列:

[1, 5, 23, 43, 61, 67, 115, 215, 305, 335, 989, 1403, 1541, 2623, 2881, 4087, 4945, 7015, 7705, 13115, 14405, 20435, 60329, 66263, 94001, 175741, 301645, 331315, 470005, 878705, 4042043, 20210215]

約数ペア:

[(1, 20210215), (5, 4042043), (23, 878705), (43, 470005), (61, 331315), (67, 301645), (115, 175741), (215, 94001), (305, 66263), (335, 60329), (989, 20435), (1403, 14405), (1541, 13115), (2623, 7705), (2881, 7015), (4087, 4945)]