81228520

素因数分解:

$2^3\times 5^1\times {\mathrm{89}}^1\times {\mathrm{22817}}^1$

素因数の和:22917

約数の個数: 32

約数和(自身を含む): 184825800

約数和(自身を除く): 103597280

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 89, 178, 356, 445, 712, 890, 1780, 3560, 22817, 45634, 91268, 114085, 182536, 228170, 456340, 912680, 2030713, 4061426, 8122852, 10153565, 16245704, 20307130, 40614260, 81228520]

約数ペア:

[(1, 81228520), (2, 40614260), (4, 20307130), (5, 16245704), (8, 10153565), (10, 8122852), (20, 4061426), (40, 2030713), (89, 912680), (178, 456340), (356, 228170), (445, 182536), (712, 114085), (890, 91268), (1780, 45634), (3560, 22817)]