19902820

素因数分解:

$2^2\times 5^1\times 7^2\times {\mathrm{23}}^1\times {\mathrm{883}}^1$

素因数の和:929

約数の個数: 72

約数和(自身を含む): 50791104

約数和(自身を除く): 30888284

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 23, 28, 35, 46, 49, 70, 92, 98, 115, 140, 161, 196, 230, 245, 322, 460, 490, 644, 805, 883, 980, 1127, 1610, 1766, 2254, 3220, 3532, 4415, 4508, 5635, 6181, 8830, 11270, 12362, 17660, 20309, 22540, 24724, 30905, 40618, 43267, 61810, 81236, 86534, 101545, 123620, 142163, 173068, 203090, 216335, 284326, 406180, 432670, 568652, 710815, 865340, 995141, 1421630, 1990282, 2843260, 3980564, 4975705, 9951410, 19902820]

約数ペア:

[(1, 19902820), (2, 9951410), (4, 4975705), (5, 3980564), (7, 2843260), (10, 1990282), (14, 1421630), (20, 995141), (23, 865340), (28, 710815), (35, 568652), (46, 432670), (49, 406180), (70, 284326), (92, 216335), (98, 203090), (115, 173068), (140, 142163), (161, 123620), (196, 101545), (230, 86534), (245, 81236), (322, 61810), (460, 43267), (490, 40618), (644, 30905), (805, 24724), (883, 22540), (980, 20309), (1127, 17660), (1610, 12362), (1766, 11270), (2254, 8830), (3220, 6181), (3532, 5635), (4415, 4508)]