20620180

素因数分解:

$2^2\times 5^1\times 7^2\times {\mathrm{53}}^1\times {\mathrm{397}}^1$

素因数の和:473

約数の個数: 72

約数和(自身を含む): 51451848

約数和(自身を除く): 30831668

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 49, 53, 70, 98, 106, 140, 196, 212, 245, 265, 371, 397, 490, 530, 742, 794, 980, 1060, 1484, 1588, 1855, 1985, 2597, 2779, 3710, 3970, 5194, 5558, 7420, 7940, 10388, 11116, 12985, 13895, 19453, 21041, 25970, 27790, 38906, 42082, 51940, 55580, 77812, 84164, 97265, 105205, 147287, 194530, 210410, 294574, 389060, 420820, 589148, 736435, 1031009, 1472870, 2062018, 2945740, 4124036, 5155045, 10310090, 20620180]

約数ペア:

[(1, 20620180), (2, 10310090), (4, 5155045), (5, 4124036), (7, 2945740), (10, 2062018), (14, 1472870), (20, 1031009), (28, 736435), (35, 589148), (49, 420820), (53, 389060), (70, 294574), (98, 210410), (106, 194530), (140, 147287), (196, 105205), (212, 97265), (245, 84164), (265, 77812), (371, 55580), (397, 51940), (490, 42082), (530, 38906), (742, 27790), (794, 25970), (980, 21041), (1060, 19453), (1484, 13895), (1588, 12985), (1855, 11116), (1985, 10388), (2597, 7940), (2779, 7420), (3710, 5558), (3970, 5194)]