21980240

素因数分解:

$2^4\times 5^1\times {\mathrm{31}}^1\times {\mathrm{8863}}^1$

素因数の和:8907

約数の個数: 40

約数和(自身を含む): 52758528

約数和(自身を除く): 30778288

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 31, 40, 62, 80, 124, 155, 248, 310, 496, 620, 1240, 2480, 8863, 17726, 35452, 44315, 70904, 88630, 141808, 177260, 274753, 354520, 549506, 709040, 1099012, 1373765, 2198024, 2747530, 4396048, 5495060, 10990120, 21980240]

約数ペア:

[(1, 21980240), (2, 10990120), (4, 5495060), (5, 4396048), (8, 2747530), (10, 2198024), (16, 1373765), (20, 1099012), (31, 709040), (40, 549506), (62, 354520), (80, 274753), (124, 177260), (155, 141808), (248, 88630), (310, 70904), (496, 44315), (620, 35452), (1240, 17726), (2480, 8863)]