21385780

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{83}}^1\times {\mathrm{991}}^1$

素因数の和:1096

約数の個数: 48

約数和(自身を含む): 48996864

約数和(自身を除く): 27611084

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 83, 130, 166, 260, 332, 415, 830, 991, 1079, 1660, 1982, 2158, 3964, 4316, 4955, 5395, 9910, 10790, 12883, 19820, 21580, 25766, 51532, 64415, 82253, 128830, 164506, 257660, 329012, 411265, 822530, 1069289, 1645060, 2138578, 4277156, 5346445, 10692890, 21385780]

約数ペア:

[(1, 21385780), (2, 10692890), (4, 5346445), (5, 4277156), (10, 2138578), (13, 1645060), (20, 1069289), (26, 822530), (52, 411265), (65, 329012), (83, 257660), (130, 164506), (166, 128830), (260, 82253), (332, 64415), (415, 51532), (830, 25766), (991, 21580), (1079, 19820), (1660, 12883), (1982, 10790), (2158, 9910), (3964, 5395), (4316, 4955)]