21409840

素因数分解:

$2^4\times 5^1\times {\mathrm{31}}^1\times {\mathrm{89}}^1\times {\mathrm{97}}^1$

素因数の和:230

約数の個数: 80

約数和(自身を含む): 52496640

約数和(自身を除く): 31086800

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 31, 40, 62, 80, 89, 97, 124, 155, 178, 194, 248, 310, 356, 388, 445, 485, 496, 620, 712, 776, 890, 970, 1240, 1424, 1552, 1780, 1940, 2480, 2759, 3007, 3560, 3880, 5518, 6014, 7120, 7760, 8633, 11036, 12028, 13795, 15035, 17266, 22072, 24056, 27590, 30070, 34532, 43165, 44144, 48112, 55180, 60140, 69064, 86330, 110360, 120280, 138128, 172660, 220720, 240560, 267623, 345320, 535246, 690640, 1070492, 1338115, 2140984, 2676230, 4281968, 5352460, 10704920, 21409840]

約数ペア:

[(1, 21409840), (2, 10704920), (4, 5352460), (5, 4281968), (8, 2676230), (10, 2140984), (16, 1338115), (20, 1070492), (31, 690640), (40, 535246), (62, 345320), (80, 267623), (89, 240560), (97, 220720), (124, 172660), (155, 138128), (178, 120280), (194, 110360), (248, 86330), (310, 69064), (356, 60140), (388, 55180), (445, 48112), (485, 44144), (496, 43165), (620, 34532), (712, 30070), (776, 27590), (890, 24056), (970, 22072), (1240, 17266), (1424, 15035), (1552, 13795), (1780, 12028), (1940, 11036), (2480, 8633), (2759, 7760), (3007, 7120), (3560, 6014), (3880, 5518)]