19937780

素因数分解:

$2^2\times 5^1\times {\mathrm{23}}^1\times {\mathrm{89}}^1\times {\mathrm{487}}^1$

素因数の和:608

約数の個数: 48

約数和(自身を含む): 44271360

約数和(自身を除く): 24333580

約数列:

[1, 2, 4, 5, 10, 20, 23, 46, 89, 92, 115, 178, 230, 356, 445, 460, 487, 890, 974, 1780, 1948, 2047, 2435, 4094, 4870, 8188, 9740, 10235, 11201, 20470, 22402, 40940, 43343, 44804, 56005, 86686, 112010, 173372, 216715, 224020, 433430, 866860, 996889, 1993778, 3987556, 4984445, 9968890, 19937780]

約数ペア:

[(1, 19937780), (2, 9968890), (4, 4984445), (5, 3987556), (10, 1993778), (20, 996889), (23, 866860), (46, 433430), (89, 224020), (92, 216715), (115, 173372), (178, 112010), (230, 86686), (356, 56005), (445, 44804), (460, 43343), (487, 40940), (890, 22402), (974, 20470), (1780, 11201), (1948, 10235), (2047, 9740), (2435, 8188), (4094, 4870)]