21386540

素因数分解:

$2^2\times 5^1\times 7^2\times {\mathrm{139}}^1\times {\mathrm{157}}^1$

素因数の和:319

約数の個数: 72

約数和(自身を含む): 52955280

約数和(自身を除く): 31568740

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 49, 70, 98, 139, 140, 157, 196, 245, 278, 314, 490, 556, 628, 695, 785, 973, 980, 1099, 1390, 1570, 1946, 2198, 2780, 3140, 3892, 4396, 4865, 5495, 6811, 7693, 9730, 10990, 13622, 15386, 19460, 21823, 21980, 27244, 30772, 34055, 38465, 43646, 68110, 76930, 87292, 109115, 136220, 152761, 153860, 218230, 305522, 436460, 611044, 763805, 1069327, 1527610, 2138654, 3055220, 4277308, 5346635, 10693270, 21386540]

約数ペア:

[(1, 21386540), (2, 10693270), (4, 5346635), (5, 4277308), (7, 3055220), (10, 2138654), (14, 1527610), (20, 1069327), (28, 763805), (35, 611044), (49, 436460), (70, 305522), (98, 218230), (139, 153860), (140, 152761), (157, 136220), (196, 109115), (245, 87292), (278, 76930), (314, 68110), (490, 43646), (556, 38465), (628, 34055), (695, 30772), (785, 27244), (973, 21980), (980, 21823), (1099, 19460), (1390, 15386), (1570, 13622), (1946, 10990), (2198, 9730), (2780, 7693), (3140, 6811), (3892, 5495), (4396, 4865)]