20866940

素因数分解:

$2^2\times 5^1\times {\mathrm{19}}^1\times {\mathrm{89}}^1\times {\mathrm{617}}^1$

素因数の和:734

約数の個数: 48

約数和(自身を含む): 46720800

約数和(自身を除く): 25853860

約数列:

[1, 2, 4, 5, 10, 19, 20, 38, 76, 89, 95, 178, 190, 356, 380, 445, 617, 890, 1234, 1691, 1780, 2468, 3085, 3382, 6170, 6764, 8455, 11723, 12340, 16910, 23446, 33820, 46892, 54913, 58615, 109826, 117230, 219652, 234460, 274565, 549130, 1043347, 1098260, 2086694, 4173388, 5216735, 10433470, 20866940]

約数ペア:

[(1, 20866940), (2, 10433470), (4, 5216735), (5, 4173388), (10, 2086694), (19, 1098260), (20, 1043347), (38, 549130), (76, 274565), (89, 234460), (95, 219652), (178, 117230), (190, 109826), (356, 58615), (380, 54913), (445, 46892), (617, 33820), (890, 23446), (1234, 16910), (1691, 12340), (1780, 11723), (2468, 8455), (3085, 6764), (3382, 6170)]