21989512

素因数分解:

$2^3\times {\mathrm{43}}^1\times {\mathrm{97}}^1\times {\mathrm{659}}^1$

素因数の和:805

約数の個数: 32

約数和(自身を含む): 42688800

約数和(自身を除く): 20699288

約数列:

[1, 2, 4, 8, 43, 86, 97, 172, 194, 344, 388, 659, 776, 1318, 2636, 4171, 5272, 8342, 16684, 28337, 33368, 56674, 63923, 113348, 127846, 226696, 255692, 511384, 2748689, 5497378, 10994756, 21989512]

約数ペア:

[(1, 21989512), (2, 10994756), (4, 5497378), (8, 2748689), (43, 511384), (86, 255692), (97, 226696), (172, 127846), (194, 113348), (344, 63923), (388, 56674), (659, 33368), (776, 28337), (1318, 16684), (2636, 8342), (4171, 5272)]