21225560

素因数分解:

$2^3\times 5^1\times {\mathrm{61}}^1\times {\mathrm{8699}}^1$

素因数の和:8771

約数の個数: 32

約数和(自身を含む): 48546000

約数和(自身を除く): 27320440

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 61, 122, 244, 305, 488, 610, 1220, 2440, 8699, 17398, 34796, 43495, 69592, 86990, 173980, 347960, 530639, 1061278, 2122556, 2653195, 4245112, 5306390, 10612780, 21225560]

約数ペア:

[(1, 21225560), (2, 10612780), (4, 5306390), (5, 4245112), (8, 2653195), (10, 2122556), (20, 1061278), (40, 530639), (61, 347960), (122, 173980), (244, 86990), (305, 69592), (488, 43495), (610, 34796), (1220, 17398), (2440, 8699)]