20639800

素因数分解:

$2^3\times 5^2\times {\mathrm{31}}^1\times {\mathrm{3329}}^1$

素因数の和:3376

約数の個数: 48

約数和(自身を含む): 49550400

約数和(自身を除く): 28910600

約数列:

[1, 2, 4, 5, 8, 10, 20, 25, 31, 40, 50, 62, 100, 124, 155, 200, 248, 310, 620, 775, 1240, 1550, 3100, 3329, 6200, 6658, 13316, 16645, 26632, 33290, 66580, 83225, 103199, 133160, 166450, 206398, 332900, 412796, 515995, 665800, 825592, 1031990, 2063980, 2579975, 4127960, 5159950, 10319900, 20639800]

約数ペア:

[(1, 20639800), (2, 10319900), (4, 5159950), (5, 4127960), (8, 2579975), (10, 2063980), (20, 1031990), (25, 825592), (31, 665800), (40, 515995), (50, 412796), (62, 332900), (100, 206398), (124, 166450), (155, 133160), (200, 103199), (248, 83225), (310, 66580), (620, 33290), (775, 26632), (1240, 16645), (1550, 13316), (3100, 6658), (3329, 6200)]