20487831

素因数分解:

$3^1\times 7^2\times {\mathrm{13}}^1\times {\mathrm{71}}^1\times {\mathrm{151}}^1$

素因数の和:252

約数の個数: 48

約数和(自身を含む): 34933248

約数和(自身を除く): 14445417

約数列:

[1, 3, 7, 13, 21, 39, 49, 71, 91, 147, 151, 213, 273, 453, 497, 637, 923, 1057, 1491, 1911, 1963, 2769, 3171, 3479, 5889, 6461, 7399, 10437, 10721, 13741, 19383, 22197, 32163, 41223, 45227, 75047, 96187, 135681, 139373, 225141, 288561, 418119, 525329, 975611, 1575987, 2926833, 6829277, 20487831]

約数ペア:

[(1, 20487831), (3, 6829277), (7, 2926833), (13, 1575987), (21, 975611), (39, 525329), (49, 418119), (71, 288561), (91, 225141), (147, 139373), (151, 135681), (213, 96187), (273, 75047), (453, 45227), (497, 41223), (637, 32163), (923, 22197), (1057, 19383), (1491, 13741), (1911, 10721), (1963, 10437), (2769, 7399), (3171, 6461), (3479, 5889)]