19881988

素因数分解:

$2^2\times 7^1\times {\mathrm{71}}^1\times {\mathrm{73}}^1\times {\mathrm{137}}^1$

素因数の和:292

約数の個数: 48

約数和(自身を含む): 41174784

約数和(自身を除く): 21292796

約数列:

[1, 2, 4, 7, 14, 28, 71, 73, 137, 142, 146, 274, 284, 292, 497, 511, 548, 959, 994, 1022, 1918, 1988, 2044, 3836, 5183, 9727, 10001, 10366, 19454, 20002, 20732, 36281, 38908, 40004, 68089, 70007, 72562, 136178, 140014, 145124, 272356, 280028, 710071, 1420142, 2840284, 4970497, 9940994, 19881988]

約数ペア:

[(1, 19881988), (2, 9940994), (4, 4970497), (7, 2840284), (14, 1420142), (28, 710071), (71, 280028), (73, 272356), (137, 145124), (142, 140014), (146, 136178), (274, 72562), (284, 70007), (292, 68089), (497, 40004), (511, 38908), (548, 36281), (959, 20732), (994, 20002), (1022, 19454), (1918, 10366), (1988, 10001), (2044, 9727), (3836, 5183)]