21500620

素因数分解:

$2^2\times 5^1\times {\mathrm{47}}^1\times {\mathrm{89}}^1\times {\mathrm{257}}^1$

素因数の和:402

約数の個数: 48

約数和(自身を含む): 46811520

約数和(自身を除く): 25310900

約数列:

[1, 2, 4, 5, 10, 20, 47, 89, 94, 178, 188, 235, 257, 356, 445, 470, 514, 890, 940, 1028, 1285, 1780, 2570, 4183, 5140, 8366, 12079, 16732, 20915, 22873, 24158, 41830, 45746, 48316, 60395, 83660, 91492, 114365, 120790, 228730, 241580, 457460, 1075031, 2150062, 4300124, 5375155, 10750310, 21500620]

約数ペア:

[(1, 21500620), (2, 10750310), (4, 5375155), (5, 4300124), (10, 2150062), (20, 1075031), (47, 457460), (89, 241580), (94, 228730), (178, 120790), (188, 114365), (235, 91492), (257, 83660), (356, 60395), (445, 48316), (470, 45746), (514, 41830), (890, 24158), (940, 22873), (1028, 20915), (1285, 16732), (1780, 12079), (2570, 8366), (4183, 5140)]