21280880

素因数分解:

$2^4\times 5^1\times {\mathrm{31}}^1\times {\mathrm{8581}}^1$

素因数の和:8625

約数の個数: 40

約数和(自身を含む): 51080064

約数和(自身を除く): 29799184

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 31, 40, 62, 80, 124, 155, 248, 310, 496, 620, 1240, 2480, 8581, 17162, 34324, 42905, 68648, 85810, 137296, 171620, 266011, 343240, 532022, 686480, 1064044, 1330055, 2128088, 2660110, 4256176, 5320220, 10640440, 21280880]

約数ペア:

[(1, 21280880), (2, 10640440), (4, 5320220), (5, 4256176), (8, 2660110), (10, 2128088), (16, 1330055), (20, 1064044), (31, 686480), (40, 532022), (62, 343240), (80, 266011), (124, 171620), (155, 137296), (248, 85810), (310, 68648), (496, 42905), (620, 34324), (1240, 17162), (2480, 8581)]