20421940

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{11}}^1\times {\mathrm{89}}^1\times {\mathrm{149}}^1$

素因数の和:265

約数の個数: 96

約数和(自身を含む): 54432000

約数和(自身を除く): 34010060

約数列:

[1, 2, 4, 5, 7, 10, 11, 14, 20, 22, 28, 35, 44, 55, 70, 77, 89, 110, 140, 149, 154, 178, 220, 298, 308, 356, 385, 445, 596, 623, 745, 770, 890, 979, 1043, 1246, 1490, 1540, 1639, 1780, 1958, 2086, 2492, 2980, 3115, 3278, 3916, 4172, 4895, 5215, 6230, 6556, 6853, 8195, 9790, 10430, 11473, 12460, 13261, 13706, 16390, 19580, 20860, 22946, 26522, 27412, 32780, 34265, 45892, 53044, 57365, 66305, 68530, 92827, 114730, 132610, 137060, 145871, 185654, 229460, 265220, 291742, 371308, 464135, 583484, 729355, 928270, 1021097, 1458710, 1856540, 2042194, 2917420, 4084388, 5105485, 10210970, 20421940]

約数ペア:

[(1, 20421940), (2, 10210970), (4, 5105485), (5, 4084388), (7, 2917420), (10, 2042194), (11, 1856540), (14, 1458710), (20, 1021097), (22, 928270), (28, 729355), (35, 583484), (44, 464135), (55, 371308), (70, 291742), (77, 265220), (89, 229460), (110, 185654), (140, 145871), (149, 137060), (154, 132610), (178, 114730), (220, 92827), (298, 68530), (308, 66305), (356, 57365), (385, 53044), (445, 45892), (596, 34265), (623, 32780), (745, 27412), (770, 26522), (890, 22946), (979, 20860), (1043, 19580), (1246, 16390), (1490, 13706), (1540, 13261), (1639, 12460), (1780, 11473), (1958, 10430), (2086, 9790), (2492, 8195), (2980, 6853), (3115, 6556), (3278, 6230), (3916, 5215), (4172, 4895)]