21581456

素因数分解:

$2^4\times {\mathrm{13}}^1\times {\mathrm{31}}^1\times {\mathrm{3347}}^1$

素因数の和:3399

約数の個数: 40

約数和(自身を含む): 46497024

約数和(自身を除く): 24915568

約数列:

[1, 2, 4, 8, 13, 16, 26, 31, 52, 62, 104, 124, 208, 248, 403, 496, 806, 1612, 3224, 3347, 6448, 6694, 13388, 26776, 43511, 53552, 87022, 103757, 174044, 207514, 348088, 415028, 696176, 830056, 1348841, 1660112, 2697682, 5395364, 10790728, 21581456]

約数ペア:

[(1, 21581456), (2, 10790728), (4, 5395364), (8, 2697682), (13, 1660112), (16, 1348841), (26, 830056), (31, 696176), (52, 415028), (62, 348088), (104, 207514), (124, 174044), (208, 103757), (248, 87022), (403, 53552), (496, 43511), (806, 26776), (1612, 13388), (3224, 6694), (3347, 6448)]