20977900

素因数分解:

$2^2\times 5^2\times {\mathrm{19}}^1\times {\mathrm{61}}^1\times {\mathrm{181}}^1$

素因数の和:275

約数の個数: 72

約数和(自身を含む): 48972560

約数和(自身を除く): 27994660

約数列:

[1, 2, 4, 5, 10, 19, 20, 25, 38, 50, 61, 76, 95, 100, 122, 181, 190, 244, 305, 362, 380, 475, 610, 724, 905, 950, 1159, 1220, 1525, 1810, 1900, 2318, 3050, 3439, 3620, 4525, 4636, 5795, 6100, 6878, 9050, 11041, 11590, 13756, 17195, 18100, 22082, 23180, 28975, 34390, 44164, 55205, 57950, 68780, 85975, 110410, 115900, 171950, 209779, 220820, 276025, 343900, 419558, 552050, 839116, 1048895, 1104100, 2097790, 4195580, 5244475, 10488950, 20977900]

約数ペア:

[(1, 20977900), (2, 10488950), (4, 5244475), (5, 4195580), (10, 2097790), (19, 1104100), (20, 1048895), (25, 839116), (38, 552050), (50, 419558), (61, 343900), (76, 276025), (95, 220820), (100, 209779), (122, 171950), (181, 115900), (190, 110410), (244, 85975), (305, 68780), (362, 57950), (380, 55205), (475, 44164), (610, 34390), (724, 28975), (905, 23180), (950, 22082), (1159, 18100), (1220, 17195), (1525, 13756), (1810, 11590), (1900, 11041), (2318, 9050), (3050, 6878), (3439, 6100), (3620, 5795), (4525, 4636)]