20296780

素因数分解:

$2^2\times 5^1\times 7^2\times {\mathrm{139}}^1\times {\mathrm{149}}^1$

素因数の和:311

約数の個数: 72

約数和(自身を含む): 50274000

約数和(自身を除く): 29977220

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 49, 70, 98, 139, 140, 149, 196, 245, 278, 298, 490, 556, 596, 695, 745, 973, 980, 1043, 1390, 1490, 1946, 2086, 2780, 2980, 3892, 4172, 4865, 5215, 6811, 7301, 9730, 10430, 13622, 14602, 19460, 20711, 20860, 27244, 29204, 34055, 36505, 41422, 68110, 73010, 82844, 103555, 136220, 144977, 146020, 207110, 289954, 414220, 579908, 724885, 1014839, 1449770, 2029678, 2899540, 4059356, 5074195, 10148390, 20296780]

約数ペア:

[(1, 20296780), (2, 10148390), (4, 5074195), (5, 4059356), (7, 2899540), (10, 2029678), (14, 1449770), (20, 1014839), (28, 724885), (35, 579908), (49, 414220), (70, 289954), (98, 207110), (139, 146020), (140, 144977), (149, 136220), (196, 103555), (245, 82844), (278, 73010), (298, 68110), (490, 41422), (556, 36505), (596, 34055), (695, 29204), (745, 27244), (973, 20860), (980, 20711), (1043, 19460), (1390, 14602), (1490, 13622), (1946, 10430), (2086, 9730), (2780, 7301), (2980, 6811), (3892, 5215), (4172, 4865)]