199911640

素因数分解:

$2^3\times 5^1\times {\mathrm{61}}^1\times {\mathrm{81931}}^1$

素因数の和:82003

約数の個数: 32

約数和(自身を含む): 457180560

約数和(自身を除く): 257268920

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 61, 122, 244, 305, 488, 610, 1220, 2440, 81931, 163862, 327724, 409655, 655448, 819310, 1638620, 3277240, 4997791, 9995582, 19991164, 24988955, 39982328, 49977910, 99955820, 199911640]

約数ペア:

[(1, 199911640), (2, 99955820), (4, 49977910), (5, 39982328), (8, 24988955), (10, 19991164), (20, 9995582), (40, 4997791), (61, 3277240), (122, 1638620), (244, 819310), (305, 655448), (488, 409655), (610, 327724), (1220, 163862), (2440, 81931)]