21142840

素因数分解:

$2^3\times 5^1\times {\mathrm{89}}^1\times {\mathrm{5939}}^1$

素因数の和:6039

約数の個数: 32

約数和(自身を含む): 48114000

約数和(自身を除く): 26971160

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 89, 178, 356, 445, 712, 890, 1780, 3560, 5939, 11878, 23756, 29695, 47512, 59390, 118780, 237560, 528571, 1057142, 2114284, 2642855, 4228568, 5285710, 10571420, 21142840]

約数ペア:

[(1, 21142840), (2, 10571420), (4, 5285710), (5, 4228568), (8, 2642855), (10, 2114284), (20, 1057142), (40, 528571), (89, 237560), (178, 118780), (356, 59390), (445, 47512), (712, 29695), (890, 23756), (1780, 11878), (3560, 5939)]