19966720

素因数分解:

$2^8\times 5^1\times {\mathrm{19}}^1\times {\mathrm{821}}^1$

素因数の和:861

約数の個数: 72

約数和(自身を含む): 50405040

約数和(自身を除く): 30438320

約数列:

[1, 2, 4, 5, 8, 10, 16, 19, 20, 32, 38, 40, 64, 76, 80, 95, 128, 152, 160, 190, 256, 304, 320, 380, 608, 640, 760, 821, 1216, 1280, 1520, 1642, 2432, 3040, 3284, 4105, 4864, 6080, 6568, 8210, 12160, 13136, 15599, 16420, 24320, 26272, 31198, 32840, 52544, 62396, 65680, 77995, 105088, 124792, 131360, 155990, 210176, 249584, 262720, 311980, 499168, 525440, 623960, 998336, 1050880, 1247920, 1996672, 2495840, 3993344, 4991680, 9983360, 19966720]

約数ペア:

[(1, 19966720), (2, 9983360), (4, 4991680), (5, 3993344), (8, 2495840), (10, 1996672), (16, 1247920), (19, 1050880), (20, 998336), (32, 623960), (38, 525440), (40, 499168), (64, 311980), (76, 262720), (80, 249584), (95, 210176), (128, 155990), (152, 131360), (160, 124792), (190, 105088), (256, 77995), (304, 65680), (320, 62396), (380, 52544), (608, 32840), (640, 31198), (760, 26272), (821, 24320), (1216, 16420), (1280, 15599), (1520, 13136), (1642, 12160), (2432, 8210), (3040, 6568), (3284, 6080), (4105, 4864)]