21019900

素因数分解:

$2^2\times 5^2\times {\mathrm{11}}^1\times {\mathrm{97}}^1\times {\mathrm{197}}^1$

素因数の和:319

約数の個数: 72

約数和(自身を含む): 50528016

約数和(自身を除く): 29508116

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 25, 44, 50, 55, 97, 100, 110, 194, 197, 220, 275, 388, 394, 485, 550, 788, 970, 985, 1067, 1100, 1940, 1970, 2134, 2167, 2425, 3940, 4268, 4334, 4850, 4925, 5335, 8668, 9700, 9850, 10670, 10835, 19109, 19700, 21340, 21670, 26675, 38218, 43340, 53350, 54175, 76436, 95545, 106700, 108350, 191090, 210199, 216700, 382180, 420398, 477725, 840796, 955450, 1050995, 1910900, 2101990, 4203980, 5254975, 10509950, 21019900]

約数ペア:

[(1, 21019900), (2, 10509950), (4, 5254975), (5, 4203980), (10, 2101990), (11, 1910900), (20, 1050995), (22, 955450), (25, 840796), (44, 477725), (50, 420398), (55, 382180), (97, 216700), (100, 210199), (110, 191090), (194, 108350), (197, 106700), (220, 95545), (275, 76436), (388, 54175), (394, 53350), (485, 43340), (550, 38218), (788, 26675), (970, 21670), (985, 21340), (1067, 19700), (1100, 19109), (1940, 10835), (1970, 10670), (2134, 9850), (2167, 9700), (2425, 8668), (3940, 5335), (4268, 4925), (4334, 4850)]