19690990

素因数分解:

$2^1\times 5^1\times {\mathrm{11}}^1\times {\mathrm{23}}^1\times {\mathrm{43}}^1\times {\mathrm{181}}^1$

素因数の和:265

約数の個数: 64

約数和(自身を含む): 41513472

約数和(自身を除く): 21822482

約数列:

[1, 2, 5, 10, 11, 22, 23, 43, 46, 55, 86, 110, 115, 181, 215, 230, 253, 362, 430, 473, 506, 905, 946, 989, 1265, 1810, 1978, 1991, 2365, 2530, 3982, 4163, 4730, 4945, 7783, 8326, 9890, 9955, 10879, 15566, 19910, 20815, 21758, 38915, 41630, 45793, 54395, 77830, 85613, 91586, 108790, 171226, 179009, 228965, 358018, 428065, 457930, 856130, 895045, 1790090, 1969099, 3938198, 9845495, 19690990]

約数ペア:

[(1, 19690990), (2, 9845495), (5, 3938198), (10, 1969099), (11, 1790090), (22, 895045), (23, 856130), (43, 457930), (46, 428065), (55, 358018), (86, 228965), (110, 179009), (115, 171226), (181, 108790), (215, 91586), (230, 85613), (253, 77830), (362, 54395), (430, 45793), (473, 41630), (506, 38915), (905, 21758), (946, 20815), (989, 19910), (1265, 15566), (1810, 10879), (1978, 9955), (1991, 9890), (2365, 8326), (2530, 7783), (3982, 4945), (4163, 4730)]