21153520

素因数分解:

$2^4\times 5^1\times {\mathrm{89}}^1\times {\mathrm{2971}}^1$

素因数の和:3073

約数の個数: 40

約数和(自身を含む): 49751280

約数和(自身を除く): 28597760

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 89, 178, 356, 445, 712, 890, 1424, 1780, 2971, 3560, 5942, 7120, 11884, 14855, 23768, 29710, 47536, 59420, 118840, 237680, 264419, 528838, 1057676, 1322095, 2115352, 2644190, 4230704, 5288380, 10576760, 21153520]

約数ペア:

[(1, 21153520), (2, 10576760), (4, 5288380), (5, 4230704), (8, 2644190), (10, 2115352), (16, 1322095), (20, 1057676), (40, 528838), (80, 264419), (89, 237680), (178, 118840), (356, 59420), (445, 47536), (712, 29710), (890, 23768), (1424, 14855), (1780, 11884), (2971, 7120), (3560, 5942)]