21281988

素因数分解:

$2^2\times 3^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{19489}}^1$

素因数の和:19516

約数の個数: 48

約数和(自身を含む): 61120640

約数和(自身を除く): 39838652

約数列:

[1, 2, 3, 4, 6, 7, 12, 13, 14, 21, 26, 28, 39, 42, 52, 78, 84, 91, 156, 182, 273, 364, 546, 1092, 19489, 38978, 58467, 77956, 116934, 136423, 233868, 253357, 272846, 409269, 506714, 545692, 760071, 818538, 1013428, 1520142, 1637076, 1773499, 3040284, 3546998, 5320497, 7093996, 10640994, 21281988]

約数ペア:

[(1, 21281988), (2, 10640994), (3, 7093996), (4, 5320497), (6, 3546998), (7, 3040284), (12, 1773499), (13, 1637076), (14, 1520142), (21, 1013428), (26, 818538), (28, 760071), (39, 545692), (42, 506714), (52, 409269), (78, 272846), (84, 253357), (91, 233868), (156, 136423), (182, 116934), (273, 77956), (364, 58467), (546, 38978), (1092, 19489)]