21457965

素因数分解:

$3^1\times 5^1\times {\mathrm{23}}^1\times {\mathrm{37}}^1\times {\mathrm{41}}^2$

素因数の和:150

約数の個数: 48

約数和(自身を含む): 37713024

約数和(自身を除く): 16255059

約数列:

[1, 3, 5, 15, 23, 37, 41, 69, 111, 115, 123, 185, 205, 345, 555, 615, 851, 943, 1517, 1681, 2553, 2829, 4255, 4551, 4715, 5043, 7585, 8405, 12765, 14145, 22755, 25215, 34891, 38663, 62197, 104673, 115989, 174455, 186591, 193315, 310985, 523365, 579945, 932955, 1430531, 4291593, 7152655, 21457965]

約数ペア:

[(1, 21457965), (3, 7152655), (5, 4291593), (15, 1430531), (23, 932955), (37, 579945), (41, 523365), (69, 310985), (111, 193315), (115, 186591), (123, 174455), (185, 115989), (205, 104673), (345, 62197), (555, 38663), (615, 34891), (851, 25215), (943, 22755), (1517, 14145), (1681, 12765), (2553, 8405), (2829, 7585), (4255, 5043), (4551, 4715)]