20405840

素因数分解:

$2^4\times 5^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{2803}}^1$

素因数の和:2836

約数の個数: 80

約数和(自身を含む): 58412928

約数和(自身を除く): 38007088

約数列:

[1, 2, 4, 5, 7, 8, 10, 13, 14, 16, 20, 26, 28, 35, 40, 52, 56, 65, 70, 80, 91, 104, 112, 130, 140, 182, 208, 260, 280, 364, 455, 520, 560, 728, 910, 1040, 1456, 1820, 2803, 3640, 5606, 7280, 11212, 14015, 19621, 22424, 28030, 36439, 39242, 44848, 56060, 72878, 78484, 98105, 112120, 145756, 156968, 182195, 196210, 224240, 255073, 291512, 313936, 364390, 392420, 510146, 583024, 728780, 784840, 1020292, 1275365, 1457560, 1569680, 2040584, 2550730, 2915120, 4081168, 5101460, 10202920, 20405840]

約数ペア:

[(1, 20405840), (2, 10202920), (4, 5101460), (5, 4081168), (7, 2915120), (8, 2550730), (10, 2040584), (13, 1569680), (14, 1457560), (16, 1275365), (20, 1020292), (26, 784840), (28, 728780), (35, 583024), (40, 510146), (52, 392420), (56, 364390), (65, 313936), (70, 291512), (80, 255073), (91, 224240), (104, 196210), (112, 182195), (130, 156968), (140, 145756), (182, 112120), (208, 98105), (260, 78484), (280, 72878), (364, 56060), (455, 44848), (520, 39242), (560, 36439), (728, 28030), (910, 22424), (1040, 19621), (1456, 14015), (1820, 11212), (2803, 7280), (3640, 5606)]