19879040

素因数分解:

$2^7\times 5^1\times {\mathrm{89}}^1\times {\mathrm{349}}^1$

素因数の和:457

約数の個数: 64

約数和(自身を含む): 48195000

約数和(自身を除く): 28315960

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 89, 128, 160, 178, 320, 349, 356, 445, 640, 698, 712, 890, 1396, 1424, 1745, 1780, 2792, 2848, 3490, 3560, 5584, 5696, 6980, 7120, 11168, 11392, 13960, 14240, 22336, 27920, 28480, 31061, 44672, 55840, 56960, 62122, 111680, 124244, 155305, 223360, 248488, 310610, 496976, 621220, 993952, 1242440, 1987904, 2484880, 3975808, 4969760, 9939520, 19879040]

約数ペア:

[(1, 19879040), (2, 9939520), (4, 4969760), (5, 3975808), (8, 2484880), (10, 1987904), (16, 1242440), (20, 993952), (32, 621220), (40, 496976), (64, 310610), (80, 248488), (89, 223360), (128, 155305), (160, 124244), (178, 111680), (320, 62122), (349, 56960), (356, 55840), (445, 44672), (640, 31061), (698, 28480), (712, 27920), (890, 22336), (1396, 14240), (1424, 13960), (1745, 11392), (1780, 11168), (2792, 7120), (2848, 6980), (3490, 5696), (3560, 5584)]