21000688821

素因数分解:

$3^2\times 7^1\times {\mathrm{23}}^1\times {\mathrm{2521}}^1\times {\mathrm{5749}}^1$

素因数の和:8306

約数の個数: 48

約数和(自身を含む): 36195744000

約数和(自身を除く): 15195055179

約数列:

[1, 3, 7, 9, 21, 23, 63, 69, 161, 207, 483, 1449, 2521, 5749, 7563, 17247, 17647, 22689, 40243, 51741, 52941, 57983, 120729, 132227, 158823, 173949, 362187, 396681, 405881, 521847, 925589, 1190043, 1217643, 2776767, 3652929, 8330301, 14493229, 43479687, 101452603, 130439061, 304357809, 333344267, 913073427, 1000032801, 2333409869, 3000098403, 7000229607, 21000688821]

約数ペア:

[(1, 21000688821), (3, 7000229607), (7, 3000098403), (9, 2333409869), (21, 1000032801), (23, 913073427), (63, 333344267), (69, 304357809), (161, 130439061), (207, 101452603), (483, 43479687), (1449, 14493229), (2521, 8330301), (5749, 3652929), (7563, 2776767), (17247, 1217643), (17647, 1190043), (22689, 925589), (40243, 521847), (51741, 405881), (52941, 396681), (57983, 362187), (120729, 173949), (132227, 158823)]