21000658252

素因数分解:

$2^2\times 7^1\times {\mathrm{47}}^1\times {\mathrm{389}}^1\times {\mathrm{41023}}^1$

素因数の和:41470

約数の個数: 48

約数和(自身を含む): 43006279680

約数和(自身を除く): 22005621428

約数列:

[1, 2, 4, 7, 14, 28, 47, 94, 188, 329, 389, 658, 778, 1316, 1556, 2723, 5446, 10892, 18283, 36566, 41023, 73132, 82046, 127981, 164092, 255962, 287161, 511924, 574322, 1148644, 1928081, 3856162, 7712324, 13496567, 15957947, 26993134, 31915894, 53986268, 63831788, 111705629, 223411258, 446822516, 750023509, 1500047018, 3000094036, 5250164563, 10500329126, 21000658252]

約数ペア:

[(1, 21000658252), (2, 10500329126), (4, 5250164563), (7, 3000094036), (14, 1500047018), (28, 750023509), (47, 446822516), (94, 223411258), (188, 111705629), (329, 63831788), (389, 53986268), (658, 31915894), (778, 26993134), (1316, 15957947), (1556, 13496567), (2723, 7712324), (5446, 3856162), (10892, 1928081), (18283, 1148644), (36566, 574322), (41023, 511924), (73132, 287161), (82046, 255962), (127981, 164092)]