21400840

素因数分解:

$2^3\times 5^1\times {\mathrm{19}}^1\times {\mathrm{29}}^1\times {\mathrm{971}}^1$

素因数の和:1030

約数の個数: 64

約数和(自身を含む): 52488000

約数和(自身を除く): 31087160

約数列:

[1, 2, 4, 5, 8, 10, 19, 20, 29, 38, 40, 58, 76, 95, 116, 145, 152, 190, 232, 290, 380, 551, 580, 760, 971, 1102, 1160, 1942, 2204, 2755, 3884, 4408, 4855, 5510, 7768, 9710, 11020, 18449, 19420, 22040, 28159, 36898, 38840, 56318, 73796, 92245, 112636, 140795, 147592, 184490, 225272, 281590, 368980, 535021, 563180, 737960, 1070042, 1126360, 2140084, 2675105, 4280168, 5350210, 10700420, 21400840]

約数ペア:

[(1, 21400840), (2, 10700420), (4, 5350210), (5, 4280168), (8, 2675105), (10, 2140084), (19, 1126360), (20, 1070042), (29, 737960), (38, 563180), (40, 535021), (58, 368980), (76, 281590), (95, 225272), (116, 184490), (145, 147592), (152, 140795), (190, 112636), (232, 92245), (290, 73796), (380, 56318), (551, 38840), (580, 36898), (760, 28159), (971, 22040), (1102, 19420), (1160, 18449), (1942, 11020), (2204, 9710), (2755, 7768), (3884, 5510), (4408, 4855)]