19801216

素因数分解:

$2^7\times {\mathrm{37}}^2\times {\mathrm{113}}^1$

素因数の和:201

約数の個数: 48

約数和(自身を含む): 40901490

約数和(自身を除く): 21100274

約数列:

[1, 2, 4, 8, 16, 32, 37, 64, 74, 113, 128, 148, 226, 296, 452, 592, 904, 1184, 1369, 1808, 2368, 2738, 3616, 4181, 4736, 5476, 7232, 8362, 10952, 14464, 16724, 21904, 33448, 43808, 66896, 87616, 133792, 154697, 175232, 267584, 309394, 535168, 618788, 1237576, 2475152, 4950304, 9900608, 19801216]

約数ペア:

[(1, 19801216), (2, 9900608), (4, 4950304), (8, 2475152), (16, 1237576), (32, 618788), (37, 535168), (64, 309394), (74, 267584), (113, 175232), (128, 154697), (148, 133792), (226, 87616), (296, 66896), (452, 43808), (592, 33448), (904, 21904), (1184, 16724), (1369, 14464), (1808, 10952), (2368, 8362), (2738, 7232), (3616, 5476), (4181, 4736)]