21872455

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{17}}^1\times {\mathrm{149}}^1\times {\mathrm{157}}^1$

素因数の和:339

約数の個数: 32

約数和(自身を含む): 30715200

約数和(自身を除く): 8842745

約数列:

[1, 5, 11, 17, 55, 85, 149, 157, 187, 745, 785, 935, 1639, 1727, 2533, 2669, 8195, 8635, 12665, 13345, 23393, 27863, 29359, 116965, 139315, 146795, 257323, 397681, 1286615, 1988405, 4374491, 21872455]

約数ペア:

[(1, 21872455), (5, 4374491), (11, 1988405), (17, 1286615), (55, 397681), (85, 257323), (149, 146795), (157, 139315), (187, 116965), (745, 29359), (785, 27863), (935, 23393), (1639, 13345), (1727, 12665), (2533, 8635), (2669, 8195)]