20961680

素因数分解:

$2^4\times 5^1\times {\mathrm{17}}^1\times {\mathrm{15413}}^1$

素因数の和:15443

約数の個数: 40

約数和(自身を含む): 51606072

約数和(自身を除く): 30644392

約数列:

[1, 2, 4, 5, 8, 10, 16, 17, 20, 34, 40, 68, 80, 85, 136, 170, 272, 340, 680, 1360, 15413, 30826, 61652, 77065, 123304, 154130, 246608, 262021, 308260, 524042, 616520, 1048084, 1233040, 1310105, 2096168, 2620210, 4192336, 5240420, 10480840, 20961680]

約数ペア:

[(1, 20961680), (2, 10480840), (4, 5240420), (5, 4192336), (8, 2620210), (10, 2096168), (16, 1310105), (17, 1233040), (20, 1048084), (34, 616520), (40, 524042), (68, 308260), (80, 262021), (85, 246608), (136, 154130), (170, 123304), (272, 77065), (340, 61652), (680, 30826), (1360, 15413)]