21209720

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{211}}^1\times {\mathrm{359}}^1$

素因数の和:588

約数の個数: 64

約数和(自身を含む): 54950400

約数和(自身を除く): 33740680

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 140, 211, 280, 359, 422, 718, 844, 1055, 1436, 1477, 1688, 1795, 2110, 2513, 2872, 2954, 3590, 4220, 5026, 5908, 7180, 7385, 8440, 10052, 11816, 12565, 14360, 14770, 20104, 25130, 29540, 50260, 59080, 75749, 100520, 151498, 302996, 378745, 530243, 605992, 757490, 1060486, 1514980, 2120972, 2651215, 3029960, 4241944, 5302430, 10604860, 21209720]

約数ペア:

[(1, 21209720), (2, 10604860), (4, 5302430), (5, 4241944), (7, 3029960), (8, 2651215), (10, 2120972), (14, 1514980), (20, 1060486), (28, 757490), (35, 605992), (40, 530243), (56, 378745), (70, 302996), (140, 151498), (211, 100520), (280, 75749), (359, 59080), (422, 50260), (718, 29540), (844, 25130), (1055, 20104), (1436, 14770), (1477, 14360), (1688, 12565), (1795, 11816), (2110, 10052), (2513, 8440), (2872, 7385), (2954, 7180), (3590, 5908), (4220, 5026)]