21704080

素因数分解:

$2^4\times 5^1\times {\mathrm{19}}^1\times {\mathrm{109}}^1\times {\mathrm{131}}^1$

素因数の和:272

約数の個数: 80

約数和(自身を含む): 54014400

約数和(自身を除く): 32310320

約数列:

[1, 2, 4, 5, 8, 10, 16, 19, 20, 38, 40, 76, 80, 95, 109, 131, 152, 190, 218, 262, 304, 380, 436, 524, 545, 655, 760, 872, 1048, 1090, 1310, 1520, 1744, 2071, 2096, 2180, 2489, 2620, 4142, 4360, 4978, 5240, 8284, 8720, 9956, 10355, 10480, 12445, 14279, 16568, 19912, 20710, 24890, 28558, 33136, 39824, 41420, 49780, 57116, 71395, 82840, 99560, 114232, 142790, 165680, 199120, 228464, 271301, 285580, 542602, 571160, 1085204, 1142320, 1356505, 2170408, 2713010, 4340816, 5426020, 10852040, 21704080]

約数ペア:

[(1, 21704080), (2, 10852040), (4, 5426020), (5, 4340816), (8, 2713010), (10, 2170408), (16, 1356505), (19, 1142320), (20, 1085204), (38, 571160), (40, 542602), (76, 285580), (80, 271301), (95, 228464), (109, 199120), (131, 165680), (152, 142790), (190, 114232), (218, 99560), (262, 82840), (304, 71395), (380, 57116), (436, 49780), (524, 41420), (545, 39824), (655, 33136), (760, 28558), (872, 24890), (1048, 20710), (1090, 19912), (1310, 16568), (1520, 14279), (1744, 12445), (2071, 10480), (2096, 10355), (2180, 9956), (2489, 8720), (2620, 8284), (4142, 5240), (4360, 4978)]