21454780

素因数分解:

$2^2\times 5^1\times {\mathrm{29}}^1\times {\mathrm{71}}^1\times {\mathrm{521}}^1$

素因数の和:630

約数の個数: 48

約数和(自身を含む): 47355840

約数和(自身を除く): 25901060

約数列:

[1, 2, 4, 5, 10, 20, 29, 58, 71, 116, 142, 145, 284, 290, 355, 521, 580, 710, 1042, 1420, 2059, 2084, 2605, 4118, 5210, 8236, 10295, 10420, 15109, 20590, 30218, 36991, 41180, 60436, 73982, 75545, 147964, 151090, 184955, 302180, 369910, 739820, 1072739, 2145478, 4290956, 5363695, 10727390, 21454780]

約数ペア:

[(1, 21454780), (2, 10727390), (4, 5363695), (5, 4290956), (10, 2145478), (20, 1072739), (29, 739820), (58, 369910), (71, 302180), (116, 184955), (142, 151090), (145, 147964), (284, 75545), (290, 73982), (355, 60436), (521, 41180), (580, 36991), (710, 30218), (1042, 20590), (1420, 15109), (2059, 10420), (2084, 10295), (2605, 8236), (4118, 5210)]