21681556

素因数分解:

$2^2\times {\mathrm{13}}^1\times {\mathrm{37}}^1\times {\mathrm{59}}^1\times {\mathrm{191}}^1$

素因数の和:304

約数の個数: 48

約数和(自身を含む): 42900480

約数和(自身を除く): 21218924

約数列:

[1, 2, 4, 13, 26, 37, 52, 59, 74, 118, 148, 191, 236, 382, 481, 764, 767, 962, 1534, 1924, 2183, 2483, 3068, 4366, 4966, 7067, 8732, 9932, 11269, 14134, 22538, 28268, 28379, 45076, 56758, 91871, 113516, 146497, 183742, 292994, 367484, 416953, 585988, 833906, 1667812, 5420389, 10840778, 21681556]

約数ペア:

[(1, 21681556), (2, 10840778), (4, 5420389), (13, 1667812), (26, 833906), (37, 585988), (52, 416953), (59, 367484), (74, 292994), (118, 183742), (148, 146497), (191, 113516), (236, 91871), (382, 56758), (481, 45076), (764, 28379), (767, 28268), (962, 22538), (1534, 14134), (1924, 11269), (2183, 9932), (2483, 8732), (3068, 7067), (4366, 4966)]