21004880

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{1063}}^1$

素因数の和:1108

約数の個数: 80

約数和(自身を含む): 55413120

約数和(自身を除く): 34408240

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 19, 20, 26, 38, 40, 52, 65, 76, 80, 95, 104, 130, 152, 190, 208, 247, 260, 304, 380, 494, 520, 760, 988, 1040, 1063, 1235, 1520, 1976, 2126, 2470, 3952, 4252, 4940, 5315, 8504, 9880, 10630, 13819, 17008, 19760, 20197, 21260, 27638, 40394, 42520, 55276, 69095, 80788, 85040, 100985, 110552, 138190, 161576, 201970, 221104, 262561, 276380, 323152, 403940, 525122, 552760, 807880, 1050244, 1105520, 1312805, 1615760, 2100488, 2625610, 4200976, 5251220, 10502440, 21004880]

約数ペア:

[(1, 21004880), (2, 10502440), (4, 5251220), (5, 4200976), (8, 2625610), (10, 2100488), (13, 1615760), (16, 1312805), (19, 1105520), (20, 1050244), (26, 807880), (38, 552760), (40, 525122), (52, 403940), (65, 323152), (76, 276380), (80, 262561), (95, 221104), (104, 201970), (130, 161576), (152, 138190), (190, 110552), (208, 100985), (247, 85040), (260, 80788), (304, 69095), (380, 55276), (494, 42520), (520, 40394), (760, 27638), (988, 21260), (1040, 20197), (1063, 19760), (1235, 17008), (1520, 13819), (1976, 10630), (2126, 9880), (2470, 8504), (3952, 5315), (4252, 4940)]