20947640

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{79}}^1\times {\mathrm{947}}^1$

素因数の和:1044

約数の個数: 64

約数和(自身を含む): 54604800

約数和(自身を除く): 33657160

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 79, 140, 158, 280, 316, 395, 553, 632, 790, 947, 1106, 1580, 1894, 2212, 2765, 3160, 3788, 4424, 4735, 5530, 6629, 7576, 9470, 11060, 13258, 18940, 22120, 26516, 33145, 37880, 53032, 66290, 74813, 132580, 149626, 265160, 299252, 374065, 523691, 598504, 748130, 1047382, 1496260, 2094764, 2618455, 2992520, 4189528, 5236910, 10473820, 20947640]

約数ペア:

[(1, 20947640), (2, 10473820), (4, 5236910), (5, 4189528), (7, 2992520), (8, 2618455), (10, 2094764), (14, 1496260), (20, 1047382), (28, 748130), (35, 598504), (40, 523691), (56, 374065), (70, 299252), (79, 265160), (140, 149626), (158, 132580), (280, 74813), (316, 66290), (395, 53032), (553, 37880), (632, 33145), (790, 26516), (947, 22120), (1106, 18940), (1580, 13258), (1894, 11060), (2212, 9470), (2765, 7576), (3160, 6629), (3788, 5530), (4424, 4735)]