19801648

素因数分解:

$2^4\times {\mathrm{19}}^1\times {\mathrm{53}}^1\times {\mathrm{1229}}^1$

素因数の和:1309

約数の個数: 40

約数和(自身を含む): 41180400

約数和(自身を除く): 21378752

約数列:

[1, 2, 4, 8, 16, 19, 38, 53, 76, 106, 152, 212, 304, 424, 848, 1007, 1229, 2014, 2458, 4028, 4916, 8056, 9832, 16112, 19664, 23351, 46702, 65137, 93404, 130274, 186808, 260548, 373616, 521096, 1042192, 1237603, 2475206, 4950412, 9900824, 19801648]

約数ペア:

[(1, 19801648), (2, 9900824), (4, 4950412), (8, 2475206), (16, 1237603), (19, 1042192), (38, 521096), (53, 373616), (76, 260548), (106, 186808), (152, 130274), (212, 93404), (304, 65137), (424, 46702), (848, 23351), (1007, 19664), (1229, 16112), (2014, 9832), (2458, 8056), (4028, 4916)]