21720520

素因数分解:

$2^3\times 5^1\times {\mathrm{191}}^1\times {\mathrm{2843}}^1$

素因数の和:3045

約数の個数: 32

約数和(自身を含む): 49144320

約数和(自身を除く): 27423800

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 191, 382, 764, 955, 1528, 1910, 2843, 3820, 5686, 7640, 11372, 14215, 22744, 28430, 56860, 113720, 543013, 1086026, 2172052, 2715065, 4344104, 5430130, 10860260, 21720520]

約数ペア:

[(1, 21720520), (2, 10860260), (4, 5430130), (5, 4344104), (8, 2715065), (10, 2172052), (20, 1086026), (40, 543013), (191, 113720), (382, 56860), (764, 28430), (955, 22744), (1528, 14215), (1910, 11372), (2843, 7640), (3820, 5686)]