21128961

素因数分解:

$3^1\times 7^1\times {\mathrm{37}}^1\times {\mathrm{71}}^1\times {\mathrm{383}}^1$

素因数の和:501

約数の個数: 32

約数和(自身を含む): 33619968

約数和(自身を除く): 12491007

約数列:

[1, 3, 7, 21, 37, 71, 111, 213, 259, 383, 497, 777, 1149, 1491, 2627, 2681, 7881, 8043, 14171, 18389, 27193, 42513, 55167, 81579, 99197, 190351, 297591, 571053, 1006141, 3018423, 7042987, 21128961]

約数ペア:

[(1, 21128961), (3, 7042987), (7, 3018423), (21, 1006141), (37, 571053), (71, 297591), (111, 190351), (213, 99197), (259, 81579), (383, 55167), (497, 42513), (777, 27193), (1149, 18389), (1491, 14171), (2627, 8043), (2681, 7881)]