21987993

素因数分解:

$3^1\times {\mathrm{67}}^1\times {\mathrm{139}}^1\times {\mathrm{787}}^1$

素因数の和:996

約数の個数: 16

約数和(自身を含む): 30007040

約数和(自身を除く): 8019047

約数列:

[1, 3, 67, 139, 201, 417, 787, 2361, 9313, 27939, 52729, 109393, 158187, 328179, 7329331, 21987993]

約数ペア:

[(1, 21987993), (3, 7329331), (67, 328179), (139, 158187), (201, 109393), (417, 52729), (787, 27939), (2361, 9313)]