21581240

素因数分解:

$2^3\times 5^1\times {\mathrm{439}}^1\times {\mathrm{1229}}^1$

素因数の和:1679

約数の個数: 32

約数和(自身を含む): 48708000

約数和(自身を除く): 27126760

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 439, 878, 1229, 1756, 2195, 2458, 3512, 4390, 4916, 6145, 8780, 9832, 12290, 17560, 24580, 49160, 539531, 1079062, 2158124, 2697655, 4316248, 5395310, 10790620, 21581240]

約数ペア:

[(1, 21581240), (2, 10790620), (4, 5395310), (5, 4316248), (8, 2697655), (10, 2158124), (20, 1079062), (40, 539531), (439, 49160), (878, 24580), (1229, 17560), (1756, 12290), (2195, 9832), (2458, 8780), (3512, 6145), (4390, 4916)]