21260420

素因数分解:

$2^2\times 5^1\times {\mathrm{31}}^1\times {\mathrm{53}}^1\times {\mathrm{647}}^1$

素因数の和:740

約数の個数: 48

約数和(自身を含む): 47029248

約数和(自身を除く): 25768828

約数列:

[1, 2, 4, 5, 10, 20, 31, 53, 62, 106, 124, 155, 212, 265, 310, 530, 620, 647, 1060, 1294, 1643, 2588, 3235, 3286, 6470, 6572, 8215, 12940, 16430, 20057, 32860, 34291, 40114, 68582, 80228, 100285, 137164, 171455, 200570, 342910, 401140, 685820, 1063021, 2126042, 4252084, 5315105, 10630210, 21260420]

約数ペア:

[(1, 21260420), (2, 10630210), (4, 5315105), (5, 4252084), (10, 2126042), (20, 1063021), (31, 685820), (53, 401140), (62, 342910), (106, 200570), (124, 171455), (155, 137164), (212, 100285), (265, 80228), (310, 68582), (530, 40114), (620, 34291), (647, 32860), (1060, 20057), (1294, 16430), (1643, 12940), (2588, 8215), (3235, 6572), (3286, 6470)]