20898920

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{101}}^1\times {\mathrm{739}}^1$

素因数の和:858

約数の個数: 64

約数和(自身を含む): 54345600

約数和(自身を除く): 33446680

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 101, 140, 202, 280, 404, 505, 707, 739, 808, 1010, 1414, 1478, 2020, 2828, 2956, 3535, 3695, 4040, 5173, 5656, 5912, 7070, 7390, 10346, 14140, 14780, 20692, 25865, 28280, 29560, 41384, 51730, 74639, 103460, 149278, 206920, 298556, 373195, 522473, 597112, 746390, 1044946, 1492780, 2089892, 2612365, 2985560, 4179784, 5224730, 10449460, 20898920]

約数ペア:

[(1, 20898920), (2, 10449460), (4, 5224730), (5, 4179784), (7, 2985560), (8, 2612365), (10, 2089892), (14, 1492780), (20, 1044946), (28, 746390), (35, 597112), (40, 522473), (56, 373195), (70, 298556), (101, 206920), (140, 149278), (202, 103460), (280, 74639), (404, 51730), (505, 41384), (707, 29560), (739, 28280), (808, 25865), (1010, 20692), (1414, 14780), (1478, 14140), (2020, 10346), (2828, 7390), (2956, 7070), (3535, 5912), (3695, 5656), (4040, 5173)]