21009620

素因数分解:

$2^2\times 5^1\times {\mathrm{17}}^1\times {\mathrm{61}}^1\times {\mathrm{1013}}^1$

素因数の和:1100

約数の個数: 48

約数和(自身を含む): 47528208

約数和(自身を除く): 26518588

約数列:

[1, 2, 4, 5, 10, 17, 20, 34, 61, 68, 85, 122, 170, 244, 305, 340, 610, 1013, 1037, 1220, 2026, 2074, 4052, 4148, 5065, 5185, 10130, 10370, 17221, 20260, 20740, 34442, 61793, 68884, 86105, 123586, 172210, 247172, 308965, 344420, 617930, 1050481, 1235860, 2100962, 4201924, 5252405, 10504810, 21009620]

約数ペア:

[(1, 21009620), (2, 10504810), (4, 5252405), (5, 4201924), (10, 2100962), (17, 1235860), (20, 1050481), (34, 617930), (61, 344420), (68, 308965), (85, 247172), (122, 172210), (170, 123586), (244, 86105), (305, 68884), (340, 61793), (610, 34442), (1013, 20740), (1037, 20260), (1220, 17221), (2026, 10370), (2074, 10130), (4052, 5185), (4148, 5065)]