20991808

素因数分解:

$2^6\times {\mathrm{19}}^1\times {\mathrm{61}}^1\times {\mathrm{283}}^1$

素因数の和:375

約数の個数: 56

約数和(自身を含む): 44724320

約数和(自身を除く): 23732512

約数列:

[1, 2, 4, 8, 16, 19, 32, 38, 61, 64, 76, 122, 152, 244, 283, 304, 488, 566, 608, 976, 1132, 1159, 1216, 1952, 2264, 2318, 3904, 4528, 4636, 5377, 9056, 9272, 10754, 17263, 18112, 18544, 21508, 34526, 37088, 43016, 69052, 74176, 86032, 138104, 172064, 276208, 327997, 344128, 552416, 655994, 1104832, 1311988, 2623976, 5247952, 10495904, 20991808]

約数ペア:

[(1, 20991808), (2, 10495904), (4, 5247952), (8, 2623976), (16, 1311988), (19, 1104832), (32, 655994), (38, 552416), (61, 344128), (64, 327997), (76, 276208), (122, 172064), (152, 138104), (244, 86032), (283, 74176), (304, 69052), (488, 43016), (566, 37088), (608, 34526), (976, 21508), (1132, 18544), (1159, 18112), (1216, 17263), (1952, 10754), (2264, 9272), (2318, 9056), (3904, 5377), (4528, 4636)]