21821840

素因数分解:

$2^4\times 5^1\times {\mathrm{41}}^1\times {\mathrm{6653}}^1$

素因数の和:6707

約数の個数: 40

約数和(自身を含む): 51981048

約数和(自身を除く): 30159208

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 41, 80, 82, 164, 205, 328, 410, 656, 820, 1640, 3280, 6653, 13306, 26612, 33265, 53224, 66530, 106448, 133060, 266120, 272773, 532240, 545546, 1091092, 1363865, 2182184, 2727730, 4364368, 5455460, 10910920, 21821840]

約数ペア:

[(1, 21821840), (2, 10910920), (4, 5455460), (5, 4364368), (8, 2727730), (10, 2182184), (16, 1363865), (20, 1091092), (40, 545546), (41, 532240), (80, 272773), (82, 266120), (164, 133060), (205, 106448), (328, 66530), (410, 53224), (656, 33265), (820, 26612), (1640, 13306), (3280, 6653)]