21151875

素因数分解:

$3^1\times 5^4\times {\mathrm{29}}^1\times {\mathrm{389}}^1$

素因数の和:441

約数の個数: 40

約数和(自身を含む): 36550800

約数和(自身を除く): 15398925

約数列:

[1, 3, 5, 15, 25, 29, 75, 87, 125, 145, 375, 389, 435, 625, 725, 1167, 1875, 1945, 2175, 3625, 5835, 9725, 10875, 11281, 18125, 29175, 33843, 48625, 54375, 56405, 145875, 169215, 243125, 282025, 729375, 846075, 1410125, 4230375, 7050625, 21151875]

約数ペア:

[(1, 21151875), (3, 7050625), (5, 4230375), (15, 1410125), (25, 846075), (29, 729375), (75, 282025), (87, 243125), (125, 169215), (145, 145875), (375, 56405), (389, 54375), (435, 48625), (625, 33843), (725, 29175), (1167, 18125), (1875, 11281), (1945, 10875), (2175, 9725), (3625, 5835)]