18901561

素因数分解:

$7^1\times {\mathrm{19}}^1\times {\mathrm{23}}^1\times {\mathrm{37}}^1\times {\mathrm{167}}^1$

素因数の和:253

約数の個数: 32

約数和(自身を含む): 24514560

約数和(自身を除く): 5612999

約数列:

[1, 7, 19, 23, 37, 133, 161, 167, 259, 437, 703, 851, 1169, 3059, 3173, 3841, 4921, 5957, 6179, 16169, 22211, 26887, 43253, 72979, 113183, 117401, 142117, 510853, 821807, 994819, 2700223, 18901561]

約数ペア:

[(1, 18901561), (7, 2700223), (19, 994819), (23, 821807), (37, 510853), (133, 142117), (161, 117401), (167, 113183), (259, 72979), (437, 43253), (703, 26887), (851, 22211), (1169, 16169), (3059, 6179), (3173, 5957), (3841, 4921)]