21051225

素因数分解:

$3^3\times 5^2\times {\mathrm{13}}^1\times {\mathrm{2399}}^1$

素因数の和:2431

約数の個数: 48

約数和(自身を含む): 41664000

約数和(自身を除く): 20612775

約数列:

[1, 3, 5, 9, 13, 15, 25, 27, 39, 45, 65, 75, 117, 135, 195, 225, 325, 351, 585, 675, 975, 1755, 2399, 2925, 7197, 8775, 11995, 21591, 31187, 35985, 59975, 64773, 93561, 107955, 155935, 179925, 280683, 323865, 467805, 539775, 779675, 842049, 1403415, 1619325, 2339025, 4210245, 7017075, 21051225]

約数ペア:

[(1, 21051225), (3, 7017075), (5, 4210245), (9, 2339025), (13, 1619325), (15, 1403415), (25, 842049), (27, 779675), (39, 539775), (45, 467805), (65, 323865), (75, 280683), (117, 179925), (135, 155935), (195, 107955), (225, 93561), (325, 64773), (351, 59975), (585, 35985), (675, 31187), (975, 21591), (1755, 11995), (2399, 8775), (2925, 7197)]