21271815

素因数分解:

$3^4\times 5^1\times {\mathrm{53}}^1\times {\mathrm{991}}^1$

素因数の和:1061

約数の個数: 40

約数和(自身を含む): 38890368

約数和(自身を除く): 17618553

約数列:

[1, 3, 5, 9, 15, 27, 45, 53, 81, 135, 159, 265, 405, 477, 795, 991, 1431, 2385, 2973, 4293, 4955, 7155, 8919, 14865, 21465, 26757, 44595, 52523, 80271, 133785, 157569, 262615, 401355, 472707, 787845, 1418121, 2363535, 4254363, 7090605, 21271815]

約数ペア:

[(1, 21271815), (3, 7090605), (5, 4254363), (9, 2363535), (15, 1418121), (27, 787845), (45, 472707), (53, 401355), (81, 262615), (135, 157569), (159, 133785), (265, 80271), (405, 52523), (477, 44595), (795, 26757), (991, 21465), (1431, 14865), (2385, 8919), (2973, 7155), (4293, 4955)]