21620979

素因数分解:

$3^3\times {\mathrm{29}}^1\times {\mathrm{53}}^1\times {\mathrm{521}}^1$

素因数の和:612

約数の個数: 32

約数和(自身を含む): 33825600

約数和(自身を除く): 12204621

約数列:

[1, 3, 9, 27, 29, 53, 87, 159, 261, 477, 521, 783, 1431, 1537, 1563, 4611, 4689, 13833, 14067, 15109, 27613, 41499, 45327, 82839, 135981, 248517, 407943, 745551, 800777, 2402331, 7206993, 21620979]

約数ペア:

[(1, 21620979), (3, 7206993), (9, 2402331), (27, 800777), (29, 745551), (53, 407943), (87, 248517), (159, 135981), (261, 82839), (477, 45327), (521, 41499), (783, 27613), (1431, 15109), (1537, 14067), (1563, 13833), (4611, 4689)]