21005780

素因数分解:

$2^2\times 5^1\times {\mathrm{89}}^1\times {\mathrm{11801}}^1$

素因数の和:11899

約数の個数: 24

約数和(自身を含む): 44611560

約数和(自身を除く): 23605780

約数列:

[1, 2, 4, 5, 10, 20, 89, 178, 356, 445, 890, 1780, 11801, 23602, 47204, 59005, 118010, 236020, 1050289, 2100578, 4201156, 5251445, 10502890, 21005780]

約数ペア:

[(1, 21005780), (2, 10502890), (4, 5251445), (5, 4201156), (10, 2100578), (20, 1050289), (89, 236020), (178, 118010), (356, 59005), (445, 47204), (890, 23602), (1780, 11801)]