20658016

素因数分解:

$2^5\times {\mathrm{19}}^1\times {\mathrm{61}}^1\times {\mathrm{557}}^1$

素因数の和:647

約数の個数: 48

約数和(自身を含む): 43590960

約数和(自身を除く): 22932944

約数列:

[1, 2, 4, 8, 16, 19, 32, 38, 61, 76, 122, 152, 244, 304, 488, 557, 608, 976, 1114, 1159, 1952, 2228, 2318, 4456, 4636, 8912, 9272, 10583, 17824, 18544, 21166, 33977, 37088, 42332, 67954, 84664, 135908, 169328, 271816, 338656, 543632, 645563, 1087264, 1291126, 2582252, 5164504, 10329008, 20658016]

約数ペア:

[(1, 20658016), (2, 10329008), (4, 5164504), (8, 2582252), (16, 1291126), (19, 1087264), (32, 645563), (38, 543632), (61, 338656), (76, 271816), (122, 169328), (152, 135908), (244, 84664), (304, 67954), (488, 42332), (557, 37088), (608, 33977), (976, 21166), (1114, 18544), (1159, 17824), (1952, 10583), (2228, 9272), (2318, 8912), (4456, 4636)]