21878829

素因数分解:

$3^4\times 7^1\times {\mathrm{47}}^1\times {\mathrm{821}}^1$

素因数の和:887

約数の個数: 40

約数和(自身を含む): 38193408

約数和(自身を除く): 16314579

約数列:

[1, 3, 7, 9, 21, 27, 47, 63, 81, 141, 189, 329, 423, 567, 821, 987, 1269, 2463, 2961, 3807, 5747, 7389, 8883, 17241, 22167, 26649, 38587, 51723, 66501, 115761, 155169, 270109, 347283, 465507, 810327, 1041849, 2430981, 3125547, 7292943, 21878829]

約数ペア:

[(1, 21878829), (3, 7292943), (7, 3125547), (9, 2430981), (21, 1041849), (27, 810327), (47, 465507), (63, 347283), (81, 270109), (141, 155169), (189, 115761), (329, 66501), (423, 51723), (567, 38587), (821, 26649), (987, 22167), (1269, 17241), (2463, 8883), (2961, 7389), (3807, 5747)]