21800440

素因数分解:

$2^3\times 5^1\times {\mathrm{31}}^1\times {\mathrm{17581}}^1$

素因数の和:17623

約数の個数: 32

約数和(自身を含む): 50636160

約数和(自身を除く): 28835720

約数列:

[1, 2, 4, 5, 8, 10, 20, 31, 40, 62, 124, 155, 248, 310, 620, 1240, 17581, 35162, 70324, 87905, 140648, 175810, 351620, 545011, 703240, 1090022, 2180044, 2725055, 4360088, 5450110, 10900220, 21800440]

約数ペア:

[(1, 21800440), (2, 10900220), (4, 5450110), (5, 4360088), (8, 2725055), (10, 2180044), (20, 1090022), (31, 703240), (40, 545011), (62, 351620), (124, 175810), (155, 140648), (248, 87905), (310, 70324), (620, 35162), (1240, 17581)]