19817680

素因数分解:

$2^4\times 5^1\times {\mathrm{31}}^1\times {\mathrm{61}}^1\times {\mathrm{131}}^1$

素因数の和:236

約数の個数: 80

約数和(自身を含む): 48711168

約数和(自身を除く): 28893488

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 31, 40, 61, 62, 80, 122, 124, 131, 155, 244, 248, 262, 305, 310, 488, 496, 524, 610, 620, 655, 976, 1048, 1220, 1240, 1310, 1891, 2096, 2440, 2480, 2620, 3782, 4061, 4880, 5240, 7564, 7991, 8122, 9455, 10480, 15128, 15982, 16244, 18910, 20305, 30256, 31964, 32488, 37820, 39955, 40610, 63928, 64976, 75640, 79910, 81220, 127856, 151280, 159820, 162440, 247721, 319640, 324880, 495442, 639280, 990884, 1238605, 1981768, 2477210, 3963536, 4954420, 9908840, 19817680]

約数ペア:

[(1, 19817680), (2, 9908840), (4, 4954420), (5, 3963536), (8, 2477210), (10, 1981768), (16, 1238605), (20, 990884), (31, 639280), (40, 495442), (61, 324880), (62, 319640), (80, 247721), (122, 162440), (124, 159820), (131, 151280), (155, 127856), (244, 81220), (248, 79910), (262, 75640), (305, 64976), (310, 63928), (488, 40610), (496, 39955), (524, 37820), (610, 32488), (620, 31964), (655, 30256), (976, 20305), (1048, 18910), (1220, 16244), (1240, 15982), (1310, 15128), (1891, 10480), (2096, 9455), (2440, 8122), (2480, 7991), (2620, 7564), (3782, 5240), (4061, 4880)]